初始提交：极码 GeekCode 全栈项目（FastAPI + Vue3）

backend/config.py

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+"""应用配置"""
+import os
+from dotenv import load_dotenv
+
+load_dotenv()
+
+# 数据库配置
+DATABASE_URL = os.getenv("DATABASE_URL", "mysql+pymysql://root:root@127.0.0.1:3306/biancheng?charset=utf8mb4")
+
+# JWT配置
+SECRET_KEY = os.getenv("SECRET_KEY", "your-secret-key-change-in-production")
+ALGORITHM = "HS256"
+ACCESS_TOKEN_EXPIRE_MINUTES = 60 * 24 * 7  # 7天
+
+# 上传文件配置
+UPLOAD_DIR = os.path.join(os.path.dirname(__file__), "uploads")
+MAX_UPLOAD_SIZE = 10 * 1024 * 1024  # 10MB
+MAX_ATTACHMENT_SIZE = 20 * 1024 * 1024  # 20MB
+
+# 腾讯云COS配置
+COS_SECRET_ID = os.getenv("COS_SECRET_ID", "")
+COS_SECRET_KEY = os.getenv("COS_SECRET_KEY", "")
+COS_BUCKET = os.getenv("COS_BUCKET", "")  # 如 bianchengshequ-1250000000
+COS_REGION = os.getenv("COS_REGION", "")  # 如 ap-beijing
+COS_CUSTOM_DOMAIN = os.getenv("COS_CUSTOM_DOMAIN", "")  # 可选，CDN自定义域名
+
+# 大模型配置
+MODEL_CONFIG = {
+    "multimodal": {
+        "provider": "google",
+        "model": "gemini-2.5-pro-preview-06-05",
+        "description": "图片/草图理解",
+    },
+    "reasoning": {
+        "provider": "anthropic",
+        "model": "claude-sonnet-4-20250514",
+        "description": "需求解读/架构分析",
+    },
+    "lightweight": {
+        "provider": "openai",
+        "model": "gpt-4o-mini",
+        "description": "分类/标签/轻量任务",
+    },
+    "knowledge_base": {
+        "provider": "deepseek",
+        "model": "deepseek-chat",
+        "description": "知识库文档理解/问答",
+    },
+    "embedding": {
+        "provider": "openai",
+        "model": "text-embedding-3-large",
+        "description": "向量化嵌入",
+    },
+}
+
+# API Key 配置
+OPENAI_API_KEY = os.getenv("OPENAI_API_KEY", "")
+ANTHROPIC_API_KEY = os.getenv("ANTHROPIC_API_KEY", "")
+GOOGLE_API_KEY = os.getenv("GOOGLE_API_KEY", "")
+DEEPSEEK_API_KEY = os.getenv("DEEPSEEK_API_KEY", "")
+
+# 火山方舟（豆包大模型）配置
+ARK_API_KEY = os.getenv("ARK_API_KEY", "")
+ARK_ENDPOINT = os.getenv("ARK_ENDPOINT", "ep-20260411180700-z6nll")
+ARK_BASE_URL = "https://ark.cn-beijing.volces.com/api/v3"

backend/database.py

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+"""数据库连接配置"""
+from sqlalchemy import create_engine
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+from config import DATABASE_URL
+
+# 根据数据库类型配置引擎参数
+if "sqlite" in DATABASE_URL:
+    engine = create_engine(DATABASE_URL, connect_args={"check_same_thread": False})
+else:
+    engine = create_engine(
+        DATABASE_URL,
+        pool_size=10,
+        max_overflow=20,
+        pool_recycle=3600,
+        pool_pre_ping=True,
+    )
+
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+Base = declarative_base()
+
+
+def get_db():
+    """获取数据库会话的依赖注入"""
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+
+def init_db():
+    """初始化数据库，创建所有表"""
+    Base.metadata.create_all(bind=engine)

backend/main.py

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+"""FastAPI 应用入口"""
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+from fastapi.staticfiles import StaticFiles
+import os
+
+from database import init_db
+from config import UPLOAD_DIR
+import models.system_config  # 确保 system_configs 表被创建
+import models.category  # 确保 categories 表被创建
+import models.nav_category  # 确保 nav_categories 表被创建
+import models.nav_link  # 确保 nav_links 表被创建
+import models.project  # 确保 projects 表被创建
+import models.shared_api  # 确保 shared_api 相关表被创建
+import models.knowledge_base  # 确保 kb 相关表被创建
+import models.attachment  # 确保 attachments 表被创建
+from routers import auth, requirement, architecture, posts, search, ai_models, bookmarks, users, notifications, upload, admin, nav, projects, shared_api, knowledge_base, web_search, ai_format
+
+# 确保上传目录存在
+os.makedirs(UPLOAD_DIR, exist_ok=True)
+
+app = FastAPI(
+    title="极码 GeekCode",
+    description="极码 GeekCode - 开发者社区、AI工具库、经验知识库",
+    version="2.0.0",
+)
+
+# CORS中间件
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["http://localhost:5173", "http://127.0.0.1:5173"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+# 静态文件（上传的图片等）
+app.mount("/uploads", StaticFiles(directory=UPLOAD_DIR), name="uploads")
+
+# 注册路由
+app.include_router(auth.router, prefix="/api/auth", tags=["认证"])
+app.include_router(requirement.router, prefix="/api/requirement", tags=["需求理解助手"])
+app.include_router(architecture.router, prefix="/api/architecture", tags=["架构选型助手"])
+app.include_router(posts.router, prefix="/api/posts", tags=["经验知识库"])
+app.include_router(search.router, prefix="/api/search", tags=["搜索"])
+app.include_router(ai_models.router)
+app.include_router(ai_models.public_router)
+app.include_router(bookmarks.router, prefix="/api/bookmarks", tags=["网站收藏"])
+app.include_router(users.router, prefix="/api/users", tags=["用户"])
+app.include_router(notifications.router, prefix="/api/notifications", tags=["消息通知"])
+app.include_router(upload.router, prefix="/api/upload", tags=["文件上传"])
+app.include_router(admin.router, prefix="/api/admin", tags=["后台管理"])
+app.include_router(nav.router, prefix="/api/nav", tags=["导航站"])
+app.include_router(projects.router, prefix="/api/projects", tags=["开源项目"])
+app.include_router(shared_api.router, prefix="/api/api-hub", tags=["API Hub"])
+app.include_router(knowledge_base.router, prefix="/api/kb", tags=["团队知识库"])
+app.include_router(web_search.router, prefix="/api/web-search", tags=["联网搜索"])
+app.include_router(ai_format.router)
+
+
+@app.on_event("startup")
+async def startup():
+    """应用启动时初始化数据库"""
+    init_db()
+    _init_default_categories()
+    _migrate_user_is_approved()
+    _migrate_project_collect_count()
+    _migrate_web_search_enabled()
+    _migrate_web_search_count()
+
+def _init_default_categories():
+    """如果分类表为空，插入默认分类"""
+    from database import SessionLocal
+    from models.category import Category
+    db = SessionLocal()
+    try:
+        if db.query(Category).count() == 0:
+            defaults = ['前端', '后端', '部署', '踩坑', '最佳实践', '工具']
+            for i, name in enumerate(defaults):
+                db.add(Category(name=name, sort_order=i))
+            db.commit()
+    finally:
+        db.close()
+
+
+def _migrate_user_is_approved():
+    """迁移：给 users 表添加 is_approved 字段（已有用户自动设为已审核）"""
+    from database import SessionLocal
+    from sqlalchemy import text
+    db = SessionLocal()
+    try:
+        # 检查字段是否存在
+        result = db.execute(text(
+            "SELECT COUNT(*) FROM information_schema.COLUMNS "
+            "WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'users' AND COLUMN_NAME = 'is_approved'"
+        ))
+        exists = result.scalar()
+        if not exists:
+            # 添加字段，先默认值1让已有用户自动通过审核
+            db.execute(text("ALTER TABLE users ADD COLUMN is_approved TINYINT(1) NOT NULL DEFAULT 1"))
+            # 再把默认值改为0，新用户需审核
+            db.execute(text("ALTER TABLE users ALTER COLUMN is_approved SET DEFAULT 0"))
+            db.commit()
+    except Exception as e:
+        db.rollback()
+        print(f"[migrate] is_approved: {e}")
+    finally:
+        db.close()
+
+
+@app.get("/api/health")
+async def health_check():
+    """健康检查"""
+    return {"status": "ok", "message": "极码 GeekCode API 运行中"}
+
+
+def _migrate_project_collect_count():
+    """迁移：给 projects 表添加 collect_count 字段"""
+    from database import SessionLocal
+    from sqlalchemy import text
+    db = SessionLocal()
+    try:
+        result = db.execute(text(
+            "SELECT COUNT(*) FROM information_schema.COLUMNS "
+            "WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'projects' AND COLUMN_NAME = 'collect_count'"
+        ))
+        if not result.scalar():
+            db.execute(text("ALTER TABLE projects ADD COLUMN collect_count INT NOT NULL DEFAULT 0"))
+            db.commit()
+    except Exception as e:
+        db.rollback()
+        print(f"[migrate] project collect_count: {e}")
+    finally:
+        db.close()
+
+
+def _migrate_web_search_enabled():
+    """迁移：给 ai_model_configs 表添加 web_search_enabled 字段"""
+    from database import SessionLocal
+    from sqlalchemy import text
+    db = SessionLocal()
+    try:
+        result = db.execute(text(
+            "SELECT COUNT(*) FROM information_schema.COLUMNS "
+            "WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'ai_model_configs' AND COLUMN_NAME = 'web_search_enabled'"
+        ))
+        if not result.scalar():
+            db.execute(text("ALTER TABLE ai_model_configs ADD COLUMN web_search_enabled TINYINT(1) NOT NULL DEFAULT 0"))
+            db.commit()
+    except Exception as e:
+        db.rollback()
+        print(f"[migrate] web_search_enabled: {e}")
+    finally:
+        db.close()
+
+
+def _migrate_web_search_count():
+    """迁移：给 ai_model_configs 表添加 web_search_count 字段"""
+    from database import SessionLocal
+    from sqlalchemy import text
+    db = SessionLocal()
+    try:
+        result = db.execute(text(
+            "SELECT COUNT(*) FROM information_schema.COLUMNS "
+            "WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'ai_model_configs' AND COLUMN_NAME = 'web_search_count'"
+        ))
+        if not result.scalar():
+            db.execute(text("ALTER TABLE ai_model_configs ADD COLUMN web_search_count INT NOT NULL DEFAULT 5"))
+            db.commit()
+    except Exception as e:
+        db.rollback()
+        print(f"[migrate] web_search_count: {e}")
+    finally:
+        db.close()

backend/models/__init__.py

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+from models.user import User
+from models.conversation import Conversation, Message
+from models.post import Post
+from models.comment import Comment
+from models.like import Like, Collect
+from models.ai_model import AIModelConfig
+from models.bookmark import BookmarkSite
+from models.follow import Follow
+from models.notification import Notification

backend/models/ai_model.py

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+"""AI模型配置模型"""
+from sqlalchemy import Column, Integer, String, Boolean, DateTime, Text
+from sqlalchemy.sql import func
+from database import Base
+
+
+class AIModelConfig(Base):
+    """AI模型配置表 - 存储各AI服务商的模型信息和API Key"""
+    __tablename__ = "ai_model_configs"
+
+    id = Column(Integer, primary_key=True, index=True)
+    provider = Column(String(50), nullable=False)  # openai/anthropic/google/deepseek
+    provider_name = Column(String(100), default="")  # 显示名称
+    model_id = Column(String(100), nullable=False)  # 模型标识符
+    model_name = Column(String(100), default="")  # 模型显示名称
+    api_key = Column(String(500), default="")  # API Key
+    base_url = Column(String(500), default="")  # 自定义API地址
+    task_type = Column(String(50), default="")  # 任务类型: multimodal/reasoning/lightweight/embedding
+    is_enabled = Column(Boolean, default=True)  # 是否启用
+    is_default = Column(Boolean, default=False)  # 是否为该任务类型的默认模型
+    web_search_enabled = Column(Boolean, default=False)  # 是否启用联网搜索（仅豆包/火山方舟支持）
+    web_search_count = Column(Integer, default=5)  # 联网搜索结果条数（1-50，默认5）
+    description = Column(Text, default="")  # 描述说明
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())

backend/models/attachment.py

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+"""附件模型"""
+from sqlalchemy import Column, Integer, String, BigInteger, DateTime, ForeignKey
+from sqlalchemy.sql import func
+from database import Base
+
+
+class Attachment(Base):
+    __tablename__ = "attachments"
+
+    id = Column(Integer, primary_key=True, index=True)
+    post_id = Column(Integer, nullable=True, default=None, index=True)  # 新建文章时为null，发布后回填
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    filename = Column(String(255), nullable=False)  # 原始文件名
+    storage_key = Column(String(500), nullable=False)  # COS对象键
+    url = Column(String(500), nullable=False)  # 完整访问URL
+    file_size = Column(BigInteger, nullable=False)  # 文件大小（字节）
+    file_type = Column(String(100), nullable=False)  # MIME类型
+    created_at = Column(DateTime(timezone=True), server_default=func.now())

backend/models/bookmark.py

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+"""网站收藏模型"""
+from sqlalchemy import Column, Integer, String, DateTime, ForeignKey
+from sqlalchemy.sql import func
+from database import Base
+
+
+class BookmarkSite(Base):
+    __tablename__ = "bookmark_sites"
+
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False, index=True)
+    name = Column(String(100), nullable=False)
+    url = Column(String(500), nullable=False)
+    icon = Column(String(500), default="")
+    sort_order = Column(Integer, default=0)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())

backend/models/category.py

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+"""帖子分类模型"""
+from sqlalchemy import Column, Integer, String, Boolean
+from database import Base
+
+
+class Category(Base):
+    """帖子分类表"""
+    __tablename__ = "categories"
+
+    id = Column(Integer, primary_key=True, index=True)
+    name = Column(String(50), unique=True, nullable=False)
+    sort_order = Column(Integer, default=0)  # 排序，越小越靠前
+    is_active = Column(Boolean, default=True)  # 是否启用

backend/models/comment.py

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+"""评论模型"""
+from sqlalchemy import Column, Integer, Text, DateTime, ForeignKey
+from sqlalchemy.sql import func
+from database import Base
+
+
+class Comment(Base):
+    __tablename__ = "comments"
+
+    id = Column(Integer, primary_key=True, index=True)
+    post_id = Column(Integer, ForeignKey("posts.id"), nullable=False, index=True)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    content = Column(Text, nullable=False)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())

backend/models/conversation.py

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+"""对话模型 - 用于需求助手和架构助手"""
+from sqlalchemy import Column, Integer, String, Text, DateTime, ForeignKey, Enum
+from sqlalchemy.sql import func
+from database import Base
+import enum
+
+
+class ConversationType(str, enum.Enum):
+    """对话类型"""
+    REQUIREMENT = "requirement"  # 需求理解
+    ARCHITECTURE = "architecture"  # 架构选型
+
+
+class Conversation(Base):
+    __tablename__ = "conversations"
+
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False, index=True)
+    title = Column(String(200), default="新对话")
+    type = Column(String(20), nullable=False)  # requirement / architecture
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())
+
+
+class Message(Base):
+    __tablename__ = "messages"
+
+    id = Column(Integer, primary_key=True, index=True)
+    conversation_id = Column(Integer, ForeignKey("conversations.id"), nullable=False, index=True)
+    role = Column(String(20), nullable=False)  # user / assistant
+    content = Column(Text, nullable=False)
+    image_urls = Column(Text, default="")  # JSON数组，存储图片路径
+    created_at = Column(DateTime(timezone=True), server_default=func.now())

backend/models/follow.py

@@ -0,0 +1,17 @@
+"""关注关系模型"""
+from sqlalchemy import Column, Integer, DateTime, ForeignKey, UniqueConstraint
+from sqlalchemy.sql import func
+from database import Base
+
+
+class Follow(Base):
+    __tablename__ = "follows"
+
+    id = Column(Integer, primary_key=True, index=True)
+    follower_id = Column(Integer, ForeignKey("users.id"), nullable=False, index=True)
+    following_id = Column(Integer, ForeignKey("users.id"), nullable=False, index=True)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+
+    __table_args__ = (
+        UniqueConstraint("follower_id", "following_id", name="uq_follow"),
+    )

backend/models/knowledge_base.py

@@ -0,0 +1,42 @@
+"""团队知识库模型"""
+from sqlalchemy import Column, Integer, String, Text, Boolean, DateTime, ForeignKey
+from sqlalchemy.sql import func
+from database import Base
+
+
+class KbCategory(Base):
+    """知识库分类"""
+    __tablename__ = "kb_categories"
+
+    id = Column(Integer, primary_key=True, index=True)
+    name = Column(String(100), nullable=False, unique=True)
+    icon = Column(String(500), default="")
+    sort_order = Column(Integer, default=0)
+    is_active = Column(Boolean, default=True, nullable=False)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+
+
+class KbItem(Base):
+    """知识库条目（关联帖子）"""
+    __tablename__ = "kb_items"
+
+    id = Column(Integer, primary_key=True, index=True)
+    category_id = Column(Integer, ForeignKey("kb_categories.id"), nullable=True, index=True)
+    post_id = Column(Integer, ForeignKey("posts.id"), nullable=False, index=True)
+    title = Column(String(200), nullable=False)
+    summary = Column(Text, default="")
+    sort_order = Column(Integer, default=0)
+    is_active = Column(Boolean, default=True, nullable=False)
+    added_by = Column(Integer, ForeignKey("users.id"), nullable=True)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+
+
+class KbAccessLog(Base):
+    """知识库访问日志"""
+    __tablename__ = "kb_access_logs"
+
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=True)
+    action = Column(String(20), default="view")  # view / search / ai_chat
+    query = Column(Text, default="")
+    created_at = Column(DateTime(timezone=True), server_default=func.now())

backend/models/like.py

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+"""点赞/收藏模型"""
+from sqlalchemy import Column, Integer, DateTime, ForeignKey, UniqueConstraint
+from sqlalchemy.sql import func
+from database import Base
+
+
+class Like(Base):
+    __tablename__ = "likes"
+
+    id = Column(Integer, primary_key=True, index=True)
+    post_id = Column(Integer, ForeignKey("posts.id"), nullable=False, index=True)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+
+    __table_args__ = (
+        UniqueConstraint("post_id", "user_id", name="uq_like_post_user"),
+    )
+
+
+class Collect(Base):
+    __tablename__ = "collects"
+
+    id = Column(Integer, primary_key=True, index=True)
+    post_id = Column(Integer, ForeignKey("posts.id"), nullable=False, index=True)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+
+    __table_args__ = (
+        UniqueConstraint("post_id", "user_id", name="uq_collect_post_user"),
+    )
+
+
+class ProjectCollect(Base):
+    """开源项目收藏"""
+    __tablename__ = "project_collects"
+
+    id = Column(Integer, primary_key=True, index=True)
+    project_id = Column(Integer, ForeignKey("projects.id"), nullable=False, index=True)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+
+    __table_args__ = (
+        UniqueConstraint("project_id", "user_id", name="uq_project_collect_user"),
+    )

backend/models/nav_category.py

@@ -0,0 +1,15 @@
+"""导航分类模型"""
+from sqlalchemy import Column, Integer, String, Boolean, DateTime
+from sqlalchemy.sql import func
+from database import Base
+
+
+class NavCategory(Base):
+    __tablename__ = "nav_categories"
+
+    id = Column(Integer, primary_key=True, index=True)
+    name = Column(String(100), nullable=False)
+    icon = Column(String(500), default="")
+    sort_order = Column(Integer, default=0)
+    is_active = Column(Boolean, default=True, nullable=False)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())

backend/models/nav_link.py

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+"""导航链接模型"""
+from sqlalchemy import Column, Integer, String, Boolean, DateTime, ForeignKey
+from sqlalchemy.sql import func
+from database import Base
+
+
+class NavLink(Base):
+    __tablename__ = "nav_links"
+
+    id = Column(Integer, primary_key=True, index=True)
+    category_id = Column(Integer, ForeignKey("nav_categories.id"), nullable=False, index=True)
+    name = Column(String(100), nullable=False)
+    url = Column(String(500), nullable=False)
+    icon = Column(String(500), default="")
+    description = Column(String(200), default="")
+    sort_order = Column(Integer, default=0)
+    is_active = Column(Boolean, default=True, nullable=False)
+    # 审核相关: approved=已通过, pending=待审核, rejected=已拒绝
+    status = Column(String(20), default="approved", nullable=False, index=True)
+    submitted_by = Column(Integer, ForeignKey("users.id"), nullable=True)
+    reject_reason = Column(String(200), default="")
+    created_at = Column(DateTime(timezone=True), server_default=func.now())

backend/models/notification.py

@@ -0,0 +1,17 @@
+"""消息通知模型"""
+from sqlalchemy import Column, Integer, String, Text, Boolean, DateTime, ForeignKey
+from sqlalchemy.sql import func
+from database import Base
+
+
+class Notification(Base):
+    __tablename__ = "notifications"
+
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False, index=True)
+    type = Column(String(20), nullable=False)  # like / comment / follow / system
+    content = Column(Text, default="")
+    related_id = Column(Integer, default=None)  # 关联的帖子/用户ID
+    from_user_id = Column(Integer, ForeignKey("users.id"), default=None)  # 触发通知的用户
+    is_read = Column(Boolean, default=False, index=True)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())

backend/models/post.py

@@ -0,0 +1,23 @@
+"""经验帖模型"""
+from sqlalchemy import Column, Integer, String, Text, DateTime, Boolean, ForeignKey
+from sqlalchemy.sql import func
+from database import Base
+
+
+class Post(Base):
+    __tablename__ = "posts"
+
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False, index=True)
+    title = Column(String(200), nullable=False)
+    content = Column(Text, nullable=False)
+    category = Column(String(50), default="")  # 分类：前端/后端/部署/踩坑/最佳实践
+    tags = Column(Text, default="")  # JSON数组存储标签
+    is_public = Column(Boolean, default=True)
+    is_draft = Column(Boolean, default=False, index=True)  # 草稿状态
+    view_count = Column(Integer, default=0)
+    like_count = Column(Integer, default=0)
+    collect_count = Column(Integer, default=0)
+    comment_count = Column(Integer, default=0)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())

backend/models/project.py

@@ -0,0 +1,24 @@
+"""开源项目模型"""
+from sqlalchemy import Column, Integer, String, Text, Boolean, DateTime
+from sqlalchemy.sql import func
+from database import Base
+
+
+class Project(Base):
+    __tablename__ = "projects"
+
+    id = Column(Integer, primary_key=True, index=True)
+    name = Column(String(200), nullable=False)
+    description = Column(Text, default="")
+    url = Column(String(500), nullable=False)
+    homepage = Column(String(500), default="")
+    icon = Column(String(500), default="")
+    language = Column(String(50), default="")
+    category = Column(String(50), default="", index=True)
+    stars = Column(Integer, default=0)
+    forks = Column(Integer, default=0)
+    collect_count = Column(Integer, default=0)
+    sort_order = Column(Integer, default=0)
+    is_active = Column(Boolean, default=True, nullable=False)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())

backend/models/shared_api.py

@@ -0,0 +1,59 @@
+"""共享API管理模型"""
+from sqlalchemy import Column, Integer, String, Text, Boolean, DateTime, ForeignKey
+from sqlalchemy.sql import func
+from database import Base
+
+
+class SharedApiCategory(Base):
+    """API分类"""
+    __tablename__ = "shared_api_categories"
+
+    id = Column(Integer, primary_key=True, index=True)
+    name = Column(String(100), nullable=False, unique=True)
+    icon = Column(String(500), default="")
+    sort_order = Column(Integer, default=0)
+    is_active = Column(Boolean, default=True, nullable=False)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+
+
+class SharedApi(Base):
+    """共享API"""
+    __tablename__ = "shared_apis"
+
+    id = Column(Integer, primary_key=True, index=True)
+    category_id = Column(Integer, ForeignKey("shared_api_categories.id"), nullable=True, index=True)
+    name = Column(String(200), nullable=False)
+    description = Column(Text, default="")
+    base_url = Column(String(500), nullable=False)
+    doc_url = Column(String(500), default="")
+    # 认证方式: none / api_key / bearer / basic
+    auth_type = Column(String(20), default="none")
+    # 加密存储的API Key
+    api_key_encrypted = Column(Text, default="")
+    # API Key 放在哪个请求头中, 如 Authorization, X-API-Key
+    api_key_header = Column(String(100), default="Authorization")
+    # 健康检查
+    health_check_url = Column(String(500), default="")
+    last_check_time = Column(DateTime(timezone=True), nullable=True)
+    last_check_status = Column(String(20), default="unknown")  # ok / error / unknown
+    # 元信息
+    added_by = Column(Integer, ForeignKey("users.id"), nullable=True)
+    tags = Column(String(500), default="")  # 逗号分隔
+    call_count = Column(Integer, default=0)
+    is_active = Column(Boolean, default=True, nullable=False)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())
+
+
+class SharedApiLog(Base):
+    """API使用日志"""
+    __tablename__ = "shared_api_logs"
+
+    id = Column(Integer, primary_key=True, index=True)
+    api_id = Column(Integer, ForeignKey("shared_apis.id"), nullable=False, index=True)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=True)
+    action = Column(String(20), default="test")  # test / health_check
+    request_url = Column(String(500), default="")
+    response_status = Column(Integer, nullable=True)
+    response_time_ms = Column(Integer, nullable=True)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())

backend/models/system_config.py

@@ -0,0 +1,15 @@
+"""系统配置模型 - 键值对存储"""
+from sqlalchemy import Column, Integer, String, Text, DateTime
+from sqlalchemy.sql import func
+from database import Base
+
+
+class SystemConfig(Base):
+    """系统配置表 - 存储OSS等系统级配置"""
+    __tablename__ = "system_configs"
+
+    id = Column(Integer, primary_key=True, index=True)
+    key = Column(String(100), unique=True, index=True, nullable=False)
+    value = Column(Text, default="")
+    description = Column(String(200), default="")
+    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())

backend/models/user.py

@@ -0,0 +1,18 @@
+"""用户模型"""
+from sqlalchemy import Column, Integer, String, DateTime, Boolean
+from sqlalchemy.sql import func
+from database import Base
+
+
+class User(Base):
+    __tablename__ = "users"
+
+    id = Column(Integer, primary_key=True, index=True)
+    username = Column(String(50), unique=True, index=True, nullable=False)
+    email = Column(String(100), unique=True, index=True, nullable=False)
+    password_hash = Column(String(200), nullable=False)
+    avatar = Column(String(500), default="")
+    is_admin = Column(Boolean, default=False, nullable=False)
+    is_banned = Column(Boolean, default=False, nullable=False)
+    is_approved = Column(Boolean, default=False, nullable=False)  # 新用户需管理员审核
+    created_at = Column(DateTime(timezone=True), server_default=func.now())

backend/requirements.txt

@@ -0,0 +1,18 @@
+fastapi==0.115.0
+uvicorn[standard]==0.30.0
+sqlalchemy==2.0.35
+alembic==1.13.0
+python-multipart==0.0.9
+python-jose[cryptography]==3.3.0
+passlib[bcrypt]==1.7.4
+bcrypt==4.0.1
+openai==1.51.0
+anthropic==0.34.0
+google-generativeai==0.8.0
+httpx==0.27.0
+python-dotenv==1.0.1
+aiofiles==24.1.0
+Pillow==10.4.0
+markdown-it-py==3.0.0
+oss2==2.19.1
+pymysql==1.1.2

backend/routers/admin.py

@@ -0,0 +1,458 @@
+"""后台管理路由"""
+from fastapi import APIRouter, Depends, HTTPException, Query
+from sqlalchemy.orm import Session
+from sqlalchemy import func as sa_func, distinct
+from datetime import datetime, timedelta
+from pydantic import BaseModel
+from typing import Optional
+
+from database import get_db
+from models.user import User
+from models.post import Post
+from models.comment import Comment
+from models.like import Like, Collect
+from models.system_config import SystemConfig
+from models.category import Category
+from routers.auth import get_admin_user, get_current_user
+
+router = APIRouter()
+
+# ---------- 对象存储配置管理（腾讯云COS） ----------
+
+COS_CONFIG_KEYS = [
+    {"key": "cos_secret_id", "description": "SecretId"},
+    {"key": "cos_secret_key", "description": "SecretKey"},
+    {"key": "cos_bucket", "description": "Bucket（如 bianchengshequ-1250000000）"},
+    {"key": "cos_region", "description": "Region（如 ap-beijing）"},
+    {"key": "cos_custom_domain", "description": "自定义域名（可选，CDN加速域名）"},
+]
+
+
+def get_cos_config_from_db(db: Session) -> dict:
+    """从数据库读取COS配置"""
+    config = {}
+    for item in COS_CONFIG_KEYS:
+        row = db.query(SystemConfig).filter(SystemConfig.key == item["key"]).first()
+        config[item["key"]] = row.value if row else ""
+    return config
+
+
+class CosConfigUpdate(BaseModel):
+    cos_secret_id: str = ""
+    cos_secret_key: Optional[str] = None
+    cos_bucket: str = ""
+    cos_region: str = ""
+    cos_custom_domain: str = ""
+
+
+@router.get("/storage/config")
+async def get_storage_config(
+    db: Session = Depends(get_db),
+    admin: User = Depends(get_admin_user),
+):
+    """获取对象存储配置"""
+    config = get_cos_config_from_db(db)
+    # 脱敏 SecretKey
+    secret = config.get("cos_secret_key", "")
+    if secret and len(secret) > 6:
+        config["cos_secret_key_masked"] = secret[:3] + "*" * (len(secret) - 6) + secret[-3:]
+    else:
+        config["cos_secret_key_masked"] = "*" * len(secret) if secret else ""
+    config.pop("cos_secret_key", None)
+    return {"config": config, "fields": COS_CONFIG_KEYS}
+
+
+@router.put("/storage/config")
+async def update_storage_config(
+    data: CosConfigUpdate,
+    db: Session = Depends(get_db),
+    admin: User = Depends(get_admin_user),
+):
+    """更新对象存储配置"""
+    updates = data.dict(exclude_none=True)
+    for key, value in updates.items():
+        row = db.query(SystemConfig).filter(SystemConfig.key == key).first()
+        if row:
+            row.value = value
+        else:
+            desc = next((i["description"] for i in COS_CONFIG_KEYS if i["key"] == key), "")
+            db.add(SystemConfig(key=key, value=value, description=desc))
+    db.commit()
+    return {"message": "配置已保存"}
+
+
+@router.post("/storage/test")
+async def test_storage_connection(
+    db: Session = Depends(get_db),
+    admin: User = Depends(get_admin_user),
+):
+    """测试COS连接"""
+    config = get_cos_config_from_db(db)
+    secret_id = config.get("cos_secret_id", "")
+    secret_key = config.get("cos_secret_key", "")
+    bucket = config.get("cos_bucket", "")
+    region = config.get("cos_region", "")
+
+    if not all([secret_id, secret_key, bucket, region]):
+        raise HTTPException(status_code=400, detail="COS配置不完整，请先填写所有必填项")
+
+    try:
+        from qcloud_cos import CosConfig, CosS3Client
+        cos_config = CosConfig(Region=region, SecretId=secret_id, SecretKey=secret_key)
+        client = CosS3Client(cos_config)
+        # 尝试获取bucket信息来验证连接
+        client.head_bucket(Bucket=bucket)
+        return {"success": True, "message": "连接成功"}
+    except ImportError:
+        raise HTTPException(status_code=500, detail="服务器未安装 cos-python-sdk-v5 库，请执行 pip install cos-python-sdk-v5")
+    except Exception as e:
+        raise HTTPException(status_code=400, detail=f"连接失败: {str(e)}")
+
+
+@router.get("/stats")
+async def get_stats(
+    db: Session = Depends(get_db),
+    admin: User = Depends(get_admin_user),
+):
+    """获取管理后台统计数据"""
+    today = datetime.utcnow().replace(hour=0, minute=0, second=0, microsecond=0)
+
+    # 基础统计
+    total_users = db.query(sa_func.count(User.id)).scalar() or 0
+    total_posts = db.query(sa_func.count(Post.id)).scalar() or 0
+    total_comments = db.query(sa_func.count(Comment.id)).scalar() or 0
+    total_likes = db.query(sa_func.count(Like.id)).scalar() or 0
+
+    # 今日新增
+    today_users = db.query(sa_func.count(User.id)).filter(User.created_at >= today).scalar() or 0
+    today_posts = db.query(sa_func.count(Post.id)).filter(Post.created_at >= today).scalar() or 0
+
+    # 今日活跃（今日有发帖/评论/点赞行为的用户）
+    active_post = db.query(distinct(Post.user_id)).filter(Post.created_at >= today)
+    active_comment = db.query(distinct(Comment.user_id)).filter(Comment.created_at >= today)
+    active_like = db.query(distinct(Like.user_id)).filter(Like.created_at >= today)
+    active_ids = set()
+    for row in active_post.all():
+        active_ids.add(row[0])
+    for row in active_comment.all():
+        active_ids.add(row[0])
+    for row in active_like.all():
+        active_ids.add(row[0])
+    today_active = len(active_ids)
+
+    # 7日趋势
+    user_trend = []
+    post_trend = []
+    for i in range(6, -1, -1):
+        day_start = today - timedelta(days=i)
+        day_end = day_start + timedelta(days=1)
+        date_str = day_start.strftime("%m-%d")
+
+        u_count = db.query(sa_func.count(User.id)).filter(
+            User.created_at >= day_start, User.created_at < day_end
+        ).scalar() or 0
+        p_count = db.query(sa_func.count(Post.id)).filter(
+            Post.created_at >= day_start, Post.created_at < day_end
+        ).scalar() or 0
+
+        user_trend.append({"date": date_str, "count": u_count})
+        post_trend.append({"date": date_str, "count": p_count})
+
+    # 最近注册用户
+    recent_users = db.query(User).order_by(User.created_at.desc()).limit(5).all()
+    recent_users_data = [
+        {"id": u.id, "username": u.username, "email": u.email, "created_at": str(u.created_at)}
+        for u in recent_users
+    ]
+
+    # 最近发布帖子
+    recent_posts = db.query(Post).order_by(Post.created_at.desc()).limit(5).all()
+    recent_posts_data = []
+    for p in recent_posts:
+        author = db.query(User).filter(User.id == p.user_id).first()
+        recent_posts_data.append({
+            "id": p.id, "title": p.title,
+            "author": author.username if author else "未知",
+            "created_at": str(p.created_at),
+        })
+
+    return {
+        "total_users": total_users,
+        "total_posts": total_posts,
+        "total_comments": total_comments,
+        "total_likes": total_likes,
+        "today_users": today_users,
+        "today_posts": today_posts,
+        "today_active": today_active,
+        "user_trend": user_trend,
+        "post_trend": post_trend,
+        "recent_users": recent_users_data,
+        "recent_posts": recent_posts_data,
+    }
+
+
+@router.get("/users")
+async def list_users(
+    search: str = "",
+    page: int = Query(1, ge=1),
+    page_size: int = Query(20, ge=1, le=100),
+    db: Session = Depends(get_db),
+    admin: User = Depends(get_admin_user),
+):
+    """用户管理列表"""
+    query = db.query(User)
+    if search:
+        query = query.filter(User.username.contains(search))
+
+    total = query.count()
+    users = query.order_by(User.created_at.desc()).offset((page - 1) * page_size).limit(page_size).all()
+
+    items = []
+    for u in users:
+        post_count = db.query(sa_func.count(Post.id)).filter(Post.user_id == u.id).scalar() or 0
+        comment_count = db.query(sa_func.count(Comment.id)).filter(Comment.user_id == u.id).scalar() or 0
+        items.append({
+            "id": u.id,
+            "username": u.username,
+            "email": u.email,
+            "avatar": u.avatar or "",
+            "is_admin": u.is_admin,
+            "is_banned": getattr(u, 'is_banned', False),
+            "is_approved": getattr(u, 'is_approved', True),
+            "post_count": post_count,
+            "comment_count": comment_count,
+            "created_at": str(u.created_at),
+        })
+
+    return {"items": items, "total": total, "page": page, "page_size": page_size}
+
+
+@router.put("/users/{user_id}/toggle-admin")
+async def toggle_admin(
+    user_id: int,
+    db: Session = Depends(get_db),
+    admin: User = Depends(get_admin_user),
+):
+    """切换用户管理员身份"""
+    user = db.query(User).filter(User.id == user_id).first()
+    if not user:
+        raise HTTPException(status_code=404, detail="用户不存在")
+    if user.id == admin.id:
+        raise HTTPException(status_code=400, detail="不能修改自己的管理员状态")
+    user.is_admin = not user.is_admin
+    db.commit()
+    return {"message": f"已{'设为' if user.is_admin else '取消'}管理员", "is_admin": user.is_admin}
+
+
+@router.put("/users/{user_id}/toggle-ban")
+async def toggle_ban(
+    user_id: int,
+    db: Session = Depends(get_db),
+    admin: User = Depends(get_admin_user),
+):
+    """封禁/解封用户"""
+    user = db.query(User).filter(User.id == user_id).first()
+    if not user:
+        raise HTTPException(status_code=404, detail="用户不存在")
+    if user.id == admin.id:
+        raise HTTPException(status_code=400, detail="不能封禁自己")
+    if user.is_admin:
+        raise HTTPException(status_code=400, detail="不能封禁管理员")
+    user.is_banned = not user.is_banned
+    db.commit()
+    return {"message": f"已{'封禁' if user.is_banned else '解封'}该用户", "is_banned": user.is_banned}
+
+
+@router.put("/users/{user_id}/approve")
+async def approve_user(
+    user_id: int,
+    db: Session = Depends(get_db),
+    admin: User = Depends(get_admin_user),
+):
+    """审核通过用户"""
+    user = db.query(User).filter(User.id == user_id).first()
+    if not user:
+        raise HTTPException(status_code=404, detail="用户不存在")
+    if getattr(user, 'is_approved', False):
+        raise HTTPException(status_code=400, detail="该用户已通过审核")
+    user.is_approved = True
+    db.commit()
+    return {"message": f"已审核通过用户：{user.username}", "is_approved": True}
+
+
+@router.put("/users/{user_id}/reject")
+async def reject_user(
+    user_id: int,
+    db: Session = Depends(get_db),
+    admin: User = Depends(get_admin_user),
+):
+    """拒绝/撤回用户审核"""
+    user = db.query(User).filter(User.id == user_id).first()
+    if not user:
+        raise HTTPException(status_code=404, detail="用户不存在")
+    if user.is_admin:
+        raise HTTPException(status_code=400, detail="不能拒绝管理员")
+    user.is_approved = False
+    db.commit()
+    return {"message": f"已拒绝用户：{user.username}", "is_approved": False}
+
+
+@router.get("/posts")
+async def list_posts(
+    search: str = "",
+    page: int = Query(1, ge=1),
+    page_size: int = Query(20, ge=1, le=100),
+    db: Session = Depends(get_db),
+    admin: User = Depends(get_admin_user),
+):
+    """帖子管理列表"""
+    query = db.query(Post)
+    if search:
+        query = query.filter(Post.title.contains(search))
+
+    total = query.count()
+    posts = query.order_by(Post.created_at.desc()).offset((page - 1) * page_size).limit(page_size).all()
+
+    items = []
+    for p in posts:
+        author = db.query(User).filter(User.id == p.user_id).first()
+        like_count = db.query(sa_func.count(Like.id)).filter(Like.post_id == p.id).scalar() or 0
+        comment_count = db.query(sa_func.count(Comment.id)).filter(Comment.post_id == p.id).scalar() or 0
+        items.append({
+            "id": p.id,
+            "title": p.title,
+            "author": author.username if author else "未知",
+            "author_id": p.user_id,
+            "category": p.category or "",
+            "is_public": p.is_public,
+            "like_count": like_count,
+            "comment_count": comment_count,
+            "view_count": p.view_count,
+            "created_at": str(p.created_at),
+        })
+
+    return {"items": items, "total": total, "page": page, "page_size": page_size}
+
+
+@router.delete("/posts/{post_id}")
+async def delete_post(
+    post_id: int,
+    db: Session = Depends(get_db),
+    admin: User = Depends(get_admin_user),
+):
+    """管理员删除帖子"""
+    post = db.query(Post).filter(Post.id == post_id).first()
+    if not post:
+        raise HTTPException(status_code=404, detail="帖子不存在")
+    # 删除关联数据
+    db.query(Comment).filter(Comment.post_id == post_id).delete()
+    db.query(Like).filter(Like.post_id == post_id).delete()
+    db.query(Collect).filter(Collect.post_id == post_id).delete()
+    db.delete(post)
+    db.commit()
+    return {"message": "删除成功"}
+
+
+# ---------- 分类管理 ----------
+
+@router.get("/categories")
+async def list_categories(
+    db: Session = Depends(get_db),
+    admin: User = Depends(get_admin_user),
+):
+    """获取所有分类（含禁用的）"""
+    cats = db.query(Category).order_by(Category.sort_order, Category.id).all()
+    return [{"id": c.id, "name": c.name, "sort_order": c.sort_order, "is_active": c.is_active} for c in cats]
+
+
+class CategoryCreate(BaseModel):
+    name: str
+
+class CategoryUpdate(BaseModel):
+    name: Optional[str] = None
+    sort_order: Optional[int] = None
+    is_active: Optional[bool] = None
+
+
+@router.post("/categories")
+async def create_category(
+    data: CategoryCreate,
+    db: Session = Depends(get_db),
+    admin: User = Depends(get_admin_user),
+):
+    """新增分类"""
+    existing = db.query(Category).filter(Category.name == data.name).first()
+    if existing:
+        raise HTTPException(status_code=400, detail="分类名称已存在")
+    max_order = db.query(sa_func.max(Category.sort_order)).scalar() or 0
+    cat = Category(name=data.name, sort_order=max_order + 1)
+    db.add(cat)
+    db.commit()
+    db.refresh(cat)
+    return {"id": cat.id, "name": cat.name, "sort_order": cat.sort_order, "is_active": cat.is_active}
+
+
+@router.put("/categories/{cat_id}")
+async def update_category(
+    cat_id: int,
+    data: CategoryUpdate,
+    db: Session = Depends(get_db),
+    admin: User = Depends(get_admin_user),
+):
+    """修改分类"""
+    cat = db.query(Category).filter(Category.id == cat_id).first()
+    if not cat:
+        raise HTTPException(status_code=404, detail="分类不存在")
+    if data.name is not None:
+        dup = db.query(Category).filter(Category.name == data.name, Category.id != cat_id).first()
+        if dup:
+            raise HTTPException(status_code=400, detail="分类名称已存在")
+        cat.name = data.name
+    if data.sort_order is not None:
+        cat.sort_order = data.sort_order
+    if data.is_active is not None:
+        cat.is_active = data.is_active
+    db.commit()
+    return {"id": cat.id, "name": cat.name, "sort_order": cat.sort_order, "is_active": cat.is_active}
+
+
+@router.delete("/categories/{cat_id}")
+async def delete_category(
+    cat_id: int,
+    db: Session = Depends(get_db),
+    admin: User = Depends(get_admin_user),
+):
+    """删除分类"""
+    cat = db.query(Category).filter(Category.id == cat_id).first()
+    if not cat:
+        raise HTTPException(status_code=404, detail="分类不存在")
+    db.delete(cat)
+    db.commit()
+    return {"message": "删除成功"}
+
+
+@router.put("/categories/reorder")
+async def reorder_categories(
+    items: list,
+    db: Session = Depends(get_db),
+    admin: User = Depends(get_admin_user),
+):
+    """批量更新分类排序"""
+    for item in items:
+        cat = db.query(Category).filter(Category.id == item["id"]).first()
+        if cat:
+            cat.sort_order = item["sort_order"]
+    db.commit()
+    return {"message": "排序已更新"}
+
+
+# ---------- 公开分类API（无需管理员权限） ----------
+
+@router.get("/public/categories")
+async def get_public_categories(
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    """获取启用的分类列表（前台使用）"""
+    cats = db.query(Category).filter(Category.is_active == True).order_by(Category.sort_order, Category.id).all()
+    return [c.name for c in cats]

backend/routers/ai_format.py

@@ -0,0 +1,223 @@
+"""AI智能排版路由 - 文本排版 + 自动配图"""
+import json
+import uuid
+import httpx
+from datetime import datetime
+from typing import Optional
+from fastapi import APIRouter, Depends, HTTPException
+from pydantic import BaseModel
+from sqlalchemy.orm import Session
+
+from database import get_db
+from models.user import User
+from models.ai_model import AIModelConfig
+from routers.auth import get_current_user
+from services.ai_service import ai_service
+
+router = APIRouter(prefix="/api/ai", tags=["AI智能排版"])
+
+FORMAT_SYSTEM_PROMPT = """你是一位专业的文章排版编辑。你的任务是将用户提供的文章内容重新排版为结构清晰、可读性强的 Markdown 格式。
+
+【核心原则】绝对不能修改、删除、改写或替换原文的任何文字内容。原文的每一个字、每一句话都必须原样保留。你可以在合适的位置补充过渡语、小结或说明文字来增强可读性，但必须与原文明确区分，且不能改动原文已有的文字。
+
+排版规则：
+1. 分析文章结构，在合适位置添加标题层级（## 和 ###），标题文字从原文中提取
+2. 将原文中的要点整理为列表（有序或无序），但列表内容必须是原文原句
+3. 重要观点用引用块 > 包裹，引用内容必须是原文原句
+4. 关键词和重要内容用 **加粗** 标记
+5. 保留原文中所有图片链接（![...](...)格式），不要修改或删除
+6. 保留原文中所有URL链接，转为 [链接文字](url) 格式
+7. 适当添加分隔线 --- 划分章节
+8. 长段落拆分为短段落，提高可读性，但不能改变段落中的文字
+9. 如果内容中有流程或步骤，用有序列表清晰展示
+10. 不要添加原文中没有的文字、解释、总结或过渡语
+
+同时，你需要分析文章内容，为文章建议 1-2 张配图。对于每张配图，在合适的位置插入占位符，格式为：
+[AI_IMAGE: 图片描述prompt，用英文写，描述要生成的图片内容，风格简洁专业]
+
+注意：
+- 占位符要插在文章逻辑合适的位置（如章节开头、流程说明旁边）
+- prompt 用英文描述，风格：flat illustration, modern, professional, tech style
+- 不要超过 2 个图片占位符
+- 如果文章内容不适合配图（如纯代码、纯链接列表），可以不加占位符"""
+
+
+class FormatRequest(BaseModel):
+    model_config = {"protected_namespaces": ()}
+    content: str
+    generate_images: bool = False  # 是否生成配图（默认关闭）
+    model_config_id: Optional[int] = None  # 指定排版用的文本模型
+
+
+class FormatResponse(BaseModel):
+    formatted_content: str
+    images_generated: int = 0
+
+
+def _get_image_model(db: Session):
+    """从数据库查找已配置的图像生成模型（Seedream endpoint）"""
+    # 查找 task_type 包含 image 或 model_name 包含 seedream 的模型
+    model = db.query(AIModelConfig).filter(
+        AIModelConfig.is_enabled == True,
+        AIModelConfig.task_type == "image",
+    ).first()
+    if model:
+        return {
+            "api_key": model.api_key,
+            "base_url": model.base_url or "https://ark.cn-beijing.volces.com/api/v3",
+            "model_id": model.model_id,
+        }
+    return None
+
+
+async def _generate_image(api_key: str, base_url: str, model_id: str, prompt: str) -> Optional[bytes]:
+    """调用火山方舟 Seedream 生成图片，返回图片二进制数据"""
+    url = f"{base_url.rstrip('/')}/images/generations"
+    headers = {
+        "Authorization": f"Bearer {api_key}",
+        "Content-Type": "application/json",
+    }
+    payload = {
+        "model": model_id,
+        "prompt": prompt,
+        "response_format": "url",
+        "size": "1920x1080",  # 满足 Seedream 5.0 最低像素要求
+    }
+    try:
+        async with httpx.AsyncClient(timeout=60) as client:
+            resp = await client.post(url, json=payload, headers=headers)
+            if resp.status_code != 200:
+                print(f"图像生成失败: {resp.status_code} - {resp.text}")
+                return None
+            data = resp.json()
+            image_url = data.get("data", [{}])[0].get("url", "")
+            if not image_url:
+                return None
+            # 下载图片（因为 Seedream 返回的是临时链接）
+            img_resp = await client.get(image_url)
+            if img_resp.status_code == 200:
+                return img_resp.content
+            return None
+    except Exception as e:
+        print(f"图像生成异常: {e}")
+        return None
+
+
+def _upload_to_cos(db: Session, image_data: bytes) -> Optional[str]:
+    """将图片上传到 COS，返回永久 URL"""
+    from models.system_config import SystemConfig
+    keys = ["cos_secret_id", "cos_secret_key", "cos_bucket", "cos_region", "cos_custom_domain"]
+    config = {}
+    for k in keys:
+        row = db.query(SystemConfig).filter(SystemConfig.key == k).first()
+        config[k] = row.value if row else ""
+
+    secret_id = config.get("cos_secret_id", "")
+    secret_key = config.get("cos_secret_key", "")
+    bucket = config.get("cos_bucket", "")
+    region = config.get("cos_region", "")
+
+    if not all([secret_id, secret_key, bucket, region]):
+        return None
+
+    try:
+        from qcloud_cos import CosConfig, CosS3Client
+        cos_config = CosConfig(Region=region, SecretId=secret_id, SecretKey=secret_key)
+        client = CosS3Client(cos_config)
+
+        date_prefix = datetime.now().strftime("%Y/%m")
+        filename = f"{uuid.uuid4().hex}.png"
+        object_key = f"images/{date_prefix}/{filename}"
+
+        client.put_object(
+            Bucket=bucket,
+            Body=image_data,
+            Key=object_key,
+            ContentType="image/png",
+        )
+
+        custom_domain = config.get("cos_custom_domain", "")
+        if custom_domain:
+            return f"https://{custom_domain}/{object_key}"
+        return f"https://{bucket}.cos.{region}.myqcloud.com/{object_key}"
+    except Exception as e:
+        print(f"COS上传失败: {e}")
+        return None
+
+
+@router.post("/format", response_model=FormatResponse)
+async def format_article(
+    req: FormatRequest,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """AI智能排版：格式化文章 + 自动生成配图"""
+    if not req.content.strip():
+        raise HTTPException(status_code=400, detail="文章内容不能为空")
+
+    # 第1步：AI 排版文本
+    messages = [{"role": "user", "content": req.content}]
+    try:
+        formatted = await ai_service.chat(
+            task_type="reasoning",
+            messages=messages,
+            system_prompt=FORMAT_SYSTEM_PROMPT,
+            stream=False,
+            model_config_id=req.model_config_id,
+        )
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=f"AI排版失败: {str(e)}")
+
+    if not isinstance(formatted, str):
+        raise HTTPException(status_code=500, detail="AI排版返回格式异常")
+
+    # 过滤掉思考过程（DeepSeek Reasoner 会输出 <think>...</think>）
+    import re as _re
+    formatted = _re.sub(r'<think>[\s\S]*?</think>\s*', '', formatted).strip()
+    # 也过滤 <details> 格式的思考过程
+    formatted = _re.sub(r'<details>[\s\S]*?</details>\s*', '', formatted).strip()
+
+    images_generated = 0
+
+    # 第2步：生成配图（如果启用）
+    if req.generate_images:
+        import re
+        placeholders = re.findall(r'\[AI_IMAGE:\s*(.+?)\]', formatted)
+
+        if placeholders:
+            image_model = _get_image_model(db)
+            if image_model:
+                for prompt in placeholders:
+                    image_data = await _generate_image(
+                        image_model["api_key"],
+                        image_model["base_url"],
+                        image_model["model_id"],
+                        prompt.strip(),
+                    )
+                    if image_data:
+                        # 上传到 COS
+                        cos_url = _upload_to_cos(db, image_data)
+                        if cos_url:
+                            formatted = formatted.replace(
+                                f"[AI_IMAGE: {prompt}]",
+                                f"![{prompt.strip()[:50]}]({cos_url})",
+                                1,
+                            )
+                            images_generated += 1
+                            continue
+                    # 生成或上传失败，移除占位符
+                    formatted = formatted.replace(f"[AI_IMAGE: {prompt}]", "", 1)
+            else:
+                # 没有配置图像模型，清理所有占位符
+                formatted = re.sub(r'\[AI_IMAGE:\s*.+?\]', '', formatted)
+
+    # 清理可能残留的占位符
+    import re
+    formatted = re.sub(r'\[AI_IMAGE:\s*.+?\]', '', formatted)
+    # 清理多余空行
+    formatted = re.sub(r'\n{3,}', '\n\n', formatted).strip()
+
+    return FormatResponse(
+        formatted_content=formatted,
+        images_generated=images_generated,
+    )

backend/routers/ai_models.py

@@ -0,0 +1,285 @@
+"""AI模型管理路由"""
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.orm import Session
+from typing import List
+from database import get_db
+from models.ai_model import AIModelConfig
+from models.user import User
+from schemas.ai_model import AIModelCreate, AIModelUpdate, AIModelResponse, ProviderInfo
+from routers.auth import get_admin_user, get_current_user
+
+router = APIRouter(prefix="/api/admin/models", tags=["AI模型管理"])
+
+# 公开路由（登录用户可用，用于前台 AI 工具获取可选模型）
+public_router = APIRouter(prefix="/api/models", tags=["AI模型公开"])
+
+# 预置的服务商和模型信息
+PROVIDER_PRESETS = [
+    {
+        "provider": "deepseek",
+        "name": "DeepSeek",
+        "default_base_url": "https://api.deepseek.com",
+        "models": [
+            {"model_id": "deepseek-chat", "name": "DeepSeek-V3.2", "task_types": ["lightweight", "knowledge_base"], "description": "DeepSeek-V3.2 非思考模式，性价比极高"},
+            {"model_id": "deepseek-reasoner", "name": "DeepSeek-V3.2 思考", "task_types": ["reasoning", "knowledge_base"], "description": "DeepSeek-V3.2 思考模式，带推理链输出"},
+        ]
+    },
+    {
+        "provider": "openai",
+        "name": "OpenAI",
+        "default_base_url": "https://api.openai.com/v1",
+        "models": [
+            {"model_id": "gpt-4o", "name": "GPT-4o", "task_types": ["multimodal", "reasoning"], "description": "多模态旗舰模型"},
+            {"model_id": "gpt-4o-mini", "name": "GPT-4o Mini", "task_types": ["lightweight"], "description": "轻量高效模型"},
+            {"model_id": "o3-mini", "name": "o3-mini", "task_types": ["reasoning"], "description": "推理增强模型"},
+            {"model_id": "text-embedding-3-large", "name": "Embedding Large", "task_types": ["embedding"], "description": "高维度文本嵌入模型"},
+        ]
+    },
+    {
+        "provider": "anthropic",
+        "name": "Anthropic",
+        "default_base_url": "https://api.anthropic.com",
+        "models": [
+            {"model_id": "claude-sonnet-4-20250514", "name": "Claude Sonnet 4", "task_types": ["reasoning"], "description": "Claude最新推理模型"},
+            {"model_id": "claude-3-5-haiku-20241022", "name": "Claude 3.5 Haiku", "task_types": ["lightweight"], "description": "快速轻量模型"},
+        ]
+    },
+    {
+        "provider": "google",
+        "name": "Google Gemini",
+        "default_base_url": "https://generativelanguage.googleapis.com/v1beta/openai",
+        "models": [
+            {"model_id": "gemini-2.5-pro-preview-06-05", "name": "Gemini 2.5 Pro", "task_types": ["multimodal", "reasoning"], "description": "多模态能力最强"},
+            {"model_id": "gemini-2.0-flash", "name": "Gemini 2.0 Flash", "task_types": ["lightweight", "multimodal"], "description": "快速多模态模型"},
+        ]
+    },
+    {
+        "provider": "ark",
+        "name": "火山方舟（豆包）",
+        "default_base_url": "https://ark.cn-beijing.volces.com/api/v3",
+        "models": [
+            {"model_id": "ep-20260411180700-z6nll", "name": "Doubao-Seed-2.0-pro", "task_types": ["reasoning", "lightweight", "knowledge_base"], "description": "豆包旗舰模型，支持联网搜索"},
+            {"model_id": "doubao-seedream-5-0-260128", "name": "Seedream 5.0 (图像生成)", "task_types": ["image"], "description": "豆包图像生成模型，支持文生图"},
+        ]
+    },
+]
+
+TASK_TYPE_LABELS = {
+    "multimodal": "多模态（图片/草图理解）",
+    "reasoning": "推理分析（需求解读/架构分析）",
+    "lightweight": "轻量任务（分类/标签）",
+    "knowledge_base": "知识库分析（文档理解/问答）",
+    "embedding": "向量嵌入",
+    "image": "图像生成（AI配图/文生图）",
+}
+
+
+def _mask_api_key(key: str) -> str:
+    """API Key脱敏"""
+    if not key or len(key) < 8:
+        return "****" if key else ""
+    return key[:4] + "*" * (len(key) - 8) + key[-4:]
+
+
+def _to_response(model: AIModelConfig) -> dict:
+    """转换为响应格式"""
+    return {
+        "id": model.id,
+        "provider": model.provider,
+        "provider_name": model.provider_name,
+        "model_id": model.model_id,
+        "model_name": model.model_name,
+        "api_key_masked": _mask_api_key(model.api_key),
+        "base_url": model.base_url,
+        "task_type": model.task_type,
+        "is_enabled": model.is_enabled,
+        "is_default": model.is_default,
+        "web_search_enabled": model.web_search_enabled,
+        "description": model.description,
+        "created_at": model.created_at,
+        "updated_at": model.updated_at,
+    }
+
+
+@router.get("/presets", response_model=List[ProviderInfo])
+async def get_provider_presets():
+    """获取预置的服务商和模型列表"""
+    return PROVIDER_PRESETS
+
+
+@router.get("/task-types")
+async def get_task_types():
+    """获取任务类型列表"""
+    return TASK_TYPE_LABELS
+
+
+@router.get("", response_model=List[AIModelResponse])
+async def list_models(provider: str = None, task_type: str = None, db: Session = Depends(get_db)):
+    """获取所有已配置的模型"""
+    query = db.query(AIModelConfig)
+    if provider:
+        query = query.filter(AIModelConfig.provider == provider)
+    if task_type:
+        query = query.filter(AIModelConfig.task_type == task_type)
+    models = query.order_by(AIModelConfig.provider, AIModelConfig.created_at).all()
+    return [_to_response(m) for m in models]
+
+
+@router.post("", response_model=AIModelResponse)
+async def create_model(data: AIModelCreate, db: Session = Depends(get_db), admin: User = Depends(get_admin_user)):
+    """添加模型配置"""
+    model = AIModelConfig(
+        provider=data.provider,
+        provider_name=data.provider_name,
+        model_id=data.model_id,
+        model_name=data.model_name,
+        api_key=data.api_key,
+        base_url=data.base_url,
+        task_type=data.task_type,
+        is_enabled=data.is_enabled,
+        is_default=data.is_default,
+        web_search_enabled=data.web_search_enabled,
+        description=data.description,
+    )
+    # 如果设为默认，取消同任务类型的其他默认
+    if data.is_default and data.task_type:
+        db.query(AIModelConfig).filter(
+            AIModelConfig.task_type == data.task_type,
+            AIModelConfig.is_default == True
+        ).update({"is_default": False})
+    db.add(model)
+    db.commit()
+    db.refresh(model)
+    return _to_response(model)
+
+
+@router.put("/{model_id}", response_model=AIModelResponse)
+async def update_model(model_id: int, data: AIModelUpdate, db: Session = Depends(get_db), admin: User = Depends(get_admin_user)):
+    """更新模型配置"""
+    model = db.query(AIModelConfig).filter(AIModelConfig.id == model_id).first()
+    if not model:
+        raise HTTPException(status_code=404, detail="模型配置不存在")
+
+    update_data = data.dict(exclude_unset=True)
+
+    # 如果API Key为空字符串，表示不修改
+    if "api_key" in update_data and update_data["api_key"] == "":
+        del update_data["api_key"]
+
+    # 如果设为默认，取消同任务类型的其他默认
+    if update_data.get("is_default") and (update_data.get("task_type") or model.task_type):
+        task = update_data.get("task_type", model.task_type)
+        db.query(AIModelConfig).filter(
+            AIModelConfig.task_type == task,
+            AIModelConfig.is_default == True,
+            AIModelConfig.id != model_id
+        ).update({"is_default": False})
+
+    for key, value in update_data.items():
+        setattr(model, key, value)
+    db.commit()
+    db.refresh(model)
+    return _to_response(model)
+
+
+@router.delete("/{model_id}")
+async def delete_model(model_id: int, db: Session = Depends(get_db), admin: User = Depends(get_admin_user)):
+    """删除模型配置"""
+    model = db.query(AIModelConfig).filter(AIModelConfig.id == model_id).first()
+    if not model:
+        raise HTTPException(status_code=404, detail="模型配置不存在")
+    db.delete(model)
+    db.commit()
+    return {"message": "删除成功"}
+
+
+@router.post("/init-defaults")
+async def init_default_models(db: Session = Depends(get_db), admin: User = Depends(get_admin_user)):
+    """初始化默认模型配置（仅当数据库为空时）"""
+    count = db.query(AIModelConfig).count()
+    if count > 0:
+        return {"message": f"已有 {count} 条配置，跳过初始化", "count": count}
+
+    defaults = [
+        AIModelConfig(provider="deepseek", provider_name="DeepSeek", model_id="deepseek-chat",
+                      model_name="DeepSeek-V3", task_type="reasoning", is_default=True, is_enabled=True,
+                      base_url="https://api.deepseek.com/v1", description="DeepSeek最新对话模型，性价比极高"),
+        AIModelConfig(provider="deepseek", provider_name="DeepSeek", model_id="deepseek-reasoner",
+                      model_name="DeepSeek-R1", task_type="", is_enabled=True,
+                      base_url="https://api.deepseek.com/v1", description="深度推理模型，适合复杂逻辑分析"),
+        AIModelConfig(provider="openai", provider_name="OpenAI", model_id="gpt-4o-mini",
+                      model_name="GPT-4o Mini", task_type="lightweight", is_default=True, is_enabled=True,
+                      description="轻量高效模型"),
+        AIModelConfig(provider="google", provider_name="Google Gemini", model_id="gemini-2.5-pro-preview-06-05",
+                      model_name="Gemini 2.5 Pro", task_type="multimodal", is_default=True, is_enabled=True,
+                      base_url="https://generativelanguage.googleapis.com/v1beta/openai",
+                      description="多模态能力最强"),
+    ]
+    db.add_all(defaults)
+    db.commit()
+    return {"message": f"已初始化 {len(defaults)} 条默认配置", "count": len(defaults)}
+
+
+@router.post("/{model_id}/test")
+async def test_model_connection(model_id: int, db: Session = Depends(get_db), admin: User = Depends(get_admin_user)):
+    """测试模型连接是否正常"""
+    model = db.query(AIModelConfig).filter(AIModelConfig.id == model_id).first()
+    if not model:
+        raise HTTPException(status_code=404, detail="模型配置不存在")
+    if not model.api_key:
+        return {"success": False, "message": "未配置 API Key"}
+
+    try:
+        import httpx
+        headers = {"Authorization": f"Bearer {model.api_key}", "Content-Type": "application/json"}
+        base_url = model.base_url or f"https://api.{model.provider}.com/v1"
+
+        if model.provider == "anthropic":
+            headers = {"x-api-key": model.api_key, "anthropic-version": "2023-06-01", "Content-Type": "application/json"}
+            url = f"{base_url}/v1/messages"
+            payload = {"model": model.model_id, "max_tokens": 10, "messages": [{"role": "user", "content": "hi"}]}
+        else:
+            url = f"{base_url}/chat/completions"
+            payload = {"model": model.model_id, "max_tokens": 10, "messages": [{"role": "user", "content": "hi"}]}
+
+        async with httpx.AsyncClient(timeout=15.0) as client:
+            resp = await client.post(url, json=payload, headers=headers)
+            if resp.status_code == 200:
+                return {"success": True, "message": "连接成功"}
+            else:
+                return {"success": False, "message": f"HTTP {resp.status_code}: {resp.text[:200]}"}
+    except Exception as e:
+        return {"success": False, "message": f"连接失败: {str(e)}"}
+
+
+# ===== 公开接口 =====
+
+@public_router.get("/available")
+async def get_available_models(
+    task_type: str = "",
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """获取可用模型列表（登录用户可调用，不返回 API Key）"""
+    query = db.query(AIModelConfig).filter(
+        AIModelConfig.is_enabled == True,
+        AIModelConfig.api_key != "",
+    )
+    if task_type:
+        query = query.filter(AIModelConfig.task_type == task_type)
+    models = query.order_by(AIModelConfig.is_default.desc(), AIModelConfig.created_at).all()
+    return [
+        {
+            "id": m.id,
+            "provider": m.provider,
+            "provider_name": m.provider_name,
+            "model_id": m.model_id,
+            "model_name": m.model_name,
+            "task_type": m.task_type,
+            "is_default": m.is_default,
+            "web_search_enabled": m.web_search_enabled,
+            "web_search_count": m.web_search_count or 5,
+            "description": m.description,
+        }
+        for m in models
+    ]

backend/routers/architecture.py

@@ -0,0 +1,296 @@
+"""架构选型助手路由"""
+import json
+from typing import List
+from fastapi import APIRouter, Depends, HTTPException
+from fastapi.responses import StreamingResponse
+from sqlalchemy.orm import Session
+
+from database import get_db
+from models.user import User
+from models.conversation import Conversation, Message
+from schemas.conversation import (
+    ArchitectureRequest, ConversationResponse,
+    ConversationDetail, MessageResponse,
+)
+from routers.auth import get_current_user
+from services.ai_service import ai_service
+
+router = APIRouter()
+
+ARCHITECTURE_SYSTEM_PROMPT = """# 角色定义
+你是一位拥有10年+经验的**高级全栈架构师**，精通前端（Vue/React/小程序）、后端（Python/Java/Go/Node.js）、数据库（MySQL/PostgreSQL/MongoDB/Redis）、云服务与DevOps。你做过大量从0到1的项目，对技术选型的利弊、不同规模系统的架构模式了如指掌。
+
+你的工作：接收用户提供的**已确认的功能需求**（可能来自需求助手的输出），给出完整的、可直接落地开发的技术方案。
+
+> ⚠️ 本助手专注于**技术选型与架构设计**。如果用户发来的是原始甲方需求，建议先到「需求理解助手」进行需求分析。
+
+# 核心理念
+- **没有最好的技术，只有最合适的技术**：选型必须匹配项目规模、团队能力和预算
+- **方案要能落地写代码**：不出纯理论的架构图，给的方案要具体到程序员能直接开干
+- **过度设计是大忌**：小项目用微服务是灾难，要敢于推荐简单方案
+
+# 分析框架
+
+## 第一步：项目画像评估
+- 项目规模：小型（个人/小团队）/ 中型（创业公司）/ 大型（企业级）
+- 预期用户量和并发量
+- 团队技术栈偏好（如果用户有提及）
+- 预算和时间约束
+
+## 第二步：技术选型（带对比和理由）
+针对每一层给出推荐方案和备选方案：
+- 前端框架 + UI组件库
+- 后端语言 + Web框架
+- 数据库（主库 + 缓存）
+- 文件存储方案
+- 部署方案
+- 第三方服务（如果需要）
+
+## 第三步：系统架构设计
+- 整体架构图（Mermaid语法）
+- 核心数据模型（ER关系、表结构）
+- 关键接口设计（RESTful API清单）
+- 目录结构规划
+
+## 第四步：技术难点与避坑指南
+- 基于实战经验，针对该项目的具体技术难点给出解决方案
+- 常见踩坑点和规避策略
+- 安全注意事项（XSS、CSRF、SQL注入、越权等）
+
+## 第五步：开发路线图
+- MVP版本应包含哪些功能
+- 迭代计划建议
+- 工期评估（按模块拆分前后端工时）
+
+# 输出规范
+严格使用以下 Markdown 结构输出：
+
+---
+
+## 🎯 项目画像
+| 维度 | 评估 |
+|------|------|
+| 项目规模 | xxx |
+| 预期用户量 | xxx |
+| 推荐架构模式 | 单体/前后端分离/微服务 |
+
+## 🏗️ 技术选型
+| 层级 | 推荐方案 | 备选方案 | 选型理由 |
+|------|---------|---------|---------|
+| 前端框架 | xxx | xxx | xxx |
+| UI组件库 | xxx | xxx | xxx |
+| 后端框架 | xxx | xxx | xxx |
+| 数据库 | xxx | xxx | xxx |
+| 缓存 | xxx | xxx | xxx |
+| 部署 | xxx | xxx | xxx |
+
+## 📐 系统架构图
+```mermaid
+graph TB
+    A[前端] --> B[API网关]
+    B --> C[后端服务]
+    C --> D[数据库]
+```
+
+## 🗄️ 核心数据模型
+```sql
+-- 表名: xxx
+-- 说明: xxx
+CREATE TABLE xxx (
+    id BIGINT PRIMARY KEY AUTO_INCREMENT,
+    xxx VARCHAR(255) NOT NULL COMMENT 'xxx',
+    created_at DATETIME DEFAULT CURRENT_TIMESTAMP
+);
+
+-- 表间关系: xxx 1:N yyy
+```
+
+## 🔌 关键接口清单
+| 模块 | 方法 | 路径 | 说明 | 认证 |
+|------|------|------|------|------|
+| 用户 | POST | /api/auth/login | 登录 | 否 |
+
+## 📁 推荐目录结构
+```
+project/
+├── frontend/          # 前端项目
+│   ├── src/
+│   │   ├── views/     # 页面
+│   │   ├── components/# 组件
+│   │   ├── api/       # 接口
+│   │   └── stores/    # 状态管理
+├── backend/           # 后端项目
+│   ├── routers/       # 路由
+│   ├── models/        # 数据模型
+│   ├── services/      # 业务逻辑
+│   └── schemas/       # 数据校验
+```
+
+## ⚠️ 技术难点与避坑指南
+1. **【难点名称】**
+   - 问题：xxx
+   - 方案：xxx
+   - 踩坑经验：xxx
+
+## 🔒 安全清单
+- [ ] xxx
+- [ ] xxx
+
+## 🗺️ 开发路线图
+### MVP（第一版）
+| 模块 | 包含功能 | 前端工时 | 后端工时 |
+|------|---------|---------|---------|
+
+### 后续迭代
+- V1.1: xxx
+- V1.2: xxx
+
+---
+
+# 交互原则
+1. **选型必须带理由**：不说"推荐用Vue"，要说"推荐Vue 3，因为xxx；如果团队熟悉React也可以用"
+2. **方案要分档**：针对不同预算/规模给出不同方案（如"预算充足用云服务，省钱可以用VPS"）
+3. **代码要能跑**：给出的SQL、目录结构、接口设计都要是可以直接使用的
+4. **架构图用Mermaid**：使用 ```mermaid 代码块，只用基础语法，不加样式
+5. **敢于说"不需要"**：如果项目不需要Redis/微服务/消息队列，要直说，不为了显得高级而过度设计
+6. **持续深化**：用户追问某个模块时，在已有方案基础上深入展开，保持一致性"""
+
+
+@router.get("/conversations", response_model=List[ConversationResponse])
+def get_conversations(
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """获取架构对话列表"""
+    conversations = (
+        db.query(Conversation)
+        .filter(Conversation.user_id == current_user.id, Conversation.type == "architecture")
+        .order_by(Conversation.updated_at.desc())
+        .all()
+    )
+    return [ConversationResponse.model_validate(c) for c in conversations]
+
+
+@router.get("/conversations/{conversation_id}", response_model=ConversationDetail)
+def get_conversation_detail(
+    conversation_id: int,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """获取对话详情"""
+    conv = db.query(Conversation).filter(
+        Conversation.id == conversation_id,
+        Conversation.user_id == current_user.id,
+    ).first()
+    if not conv:
+        raise HTTPException(status_code=404, detail="对话不存在")
+
+    messages = (
+        db.query(Message)
+        .filter(Message.conversation_id == conversation_id)
+        .order_by(Message.created_at.asc())
+        .all()
+    )
+    result = ConversationDetail.model_validate(conv)
+    result.messages = [MessageResponse.model_validate(m) for m in messages]
+    return result
+
+
+@router.post("/recommend")
+async def recommend_architecture(
+    request: ArchitectureRequest,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """架构推荐 - 流式输出"""
+    # 创建或获取对话
+    if request.conversation_id:
+        conv = db.query(Conversation).filter(
+            Conversation.id == request.conversation_id,
+            Conversation.user_id == current_user.id,
+        ).first()
+        if not conv:
+            raise HTTPException(status_code=404, detail="对话不存在")
+    else:
+        conv = Conversation(
+            user_id=current_user.id,
+            title=request.content[:50] if request.content else "新架构咨询",
+            type="architecture",
+        )
+        db.add(conv)
+        db.commit()
+        db.refresh(conv)
+
+    # 保存用户消息
+    user_msg = Message(
+        conversation_id=conv.id,
+        role="user",
+        content=request.content,
+    )
+    db.add(user_msg)
+    db.commit()
+
+    # 构建历史消息
+    history_msgs = (
+        db.query(Message)
+        .filter(Message.conversation_id == conv.id)
+        .order_by(Message.created_at.asc())
+        .all()
+    )
+    messages = [{"role": msg.role, "content": msg.content} for msg in history_msgs]
+
+    # 流式调用AI
+    async def generate():
+        full_response = ""
+        try:
+            result = await ai_service.chat(
+                task_type="reasoning",
+                messages=messages,
+                system_prompt=ARCHITECTURE_SYSTEM_PROMPT,
+                stream=True,
+                model_config_id=request.model_config_id,
+            )
+            if isinstance(result, str):
+                full_response = result
+                yield f"data: {json.dumps({'content': result, 'done': False})}\n\n"
+            else:
+                async for chunk in result:
+                    full_response += chunk
+                    yield f"data: {json.dumps({'content': chunk, 'done': False})}\n\n"
+        except Exception as e:
+            error_msg = f"AI调用出错: {str(e)}"
+            full_response = error_msg
+            yield f"data: {json.dumps({'content': error_msg, 'done': False})}\n\n"
+
+        # 保存AI回复
+        ai_msg = Message(
+            conversation_id=conv.id,
+            role="assistant",
+            content=full_response,
+        )
+        db.add(ai_msg)
+        db.commit()
+
+        yield f"data: {json.dumps({'content': '', 'done': True, 'conversation_id': conv.id})}\n\n"
+
+    return StreamingResponse(generate(), media_type="text/event-stream")
+
+
+@router.delete("/conversations/{conversation_id}")
+def delete_conversation(
+    conversation_id: int,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """删除对话"""
+    conv = db.query(Conversation).filter(
+        Conversation.id == conversation_id,
+        Conversation.user_id == current_user.id,
+    ).first()
+    if not conv:
+        raise HTTPException(status_code=404, detail="对话不存在")
+
+    db.query(Message).filter(Message.conversation_id == conversation_id).delete()
+    db.delete(conv)
+    db.commit()
+    return {"message": "删除成功"}

backend/routers/auth.py

@@ -0,0 +1,136 @@
+"""认证路由"""
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+from passlib.context import CryptContext
+from jose import JWTError, jwt
+from datetime import datetime, timedelta
+from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
+
+from database import get_db
+from models.user import User
+from schemas.user import UserRegister, UserLogin, UserResponse, TokenResponse, UserUpdate
+from config import SECRET_KEY, ALGORITHM, ACCESS_TOKEN_EXPIRE_MINUTES
+
+router = APIRouter()
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+security = HTTPBearer()
+
+
+def create_access_token(data: dict) -> str:
+    """创建JWT Token"""
+    to_encode = data.copy()
+    expire = datetime.utcnow() + timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
+    to_encode.update({"exp": expire})
+    return jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
+
+
+def get_current_user(
+    credentials: HTTPAuthorizationCredentials = Depends(security),
+    db: Session = Depends(get_db),
+) -> User:
+    """从Token获取当前用户"""
+    token = credentials.credentials
+    try:
+        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
+        user_id = payload.get("sub")
+        if user_id is None:
+            raise HTTPException(status_code=401, detail="无效的认证凭据")
+        user_id = int(user_id)
+    except JWTError:
+        raise HTTPException(status_code=401, detail="无效的认证凭据")
+
+    user = db.query(User).filter(User.id == user_id).first()
+    if user is None:
+        raise HTTPException(status_code=401, detail="用户不存在")
+    return user
+
+
+def get_admin_user(current_user: User = Depends(get_current_user)) -> User:
+    """要求当前用户是管理员"""
+    if not current_user.is_admin:
+        raise HTTPException(status_code=403, detail="需要管理员权限")
+    return current_user
+
+
+@router.post("/register")
+def register(data: UserRegister, db: Session = Depends(get_db)):
+    """用户注册（需管理员审核后才可使用）"""
+    # 检查用户名是否已存在
+    if db.query(User).filter(User.username == data.username).first():
+        raise HTTPException(status_code=400, detail="用户名已存在")
+    if db.query(User).filter(User.email == data.email).first():
+        raise HTTPException(status_code=400, detail="邮箱已被注册")
+
+    # 创建用户（is_approved 默认 False，等待审核）
+    user = User(
+        username=data.username,
+        email=data.email,
+        password_hash=pwd_context.hash(data.password),
+    )
+    db.add(user)
+    db.commit()
+    db.refresh(user)
+
+    return {"message": "注册成功，请等待管理员审核通过后即可登录使用"}
+
+
+@router.post("/login", response_model=TokenResponse)
+def login(data: UserLogin, db: Session = Depends(get_db)):
+    """用户登录"""
+    user = db.query(User).filter(User.username == data.username).first()
+    if not user or not pwd_context.verify(data.password, user.password_hash):
+        raise HTTPException(status_code=401, detail="用户名或密码错误")
+
+    if getattr(user, 'is_banned', False):
+        raise HTTPException(status_code=403, detail="账号已被封禁，请联系管理员")
+
+    if not getattr(user, 'is_approved', False):
+        raise HTTPException(status_code=403, detail="账号尚未通过审核，请耐心等待管理员审核")
+
+    token = create_access_token({"sub": str(user.id)})
+    return TokenResponse(
+        access_token=token,
+        user=UserResponse.model_validate(user),
+    )
+
+
+@router.get("/me", response_model=UserResponse)
+def get_me(current_user: User = Depends(get_current_user)):
+    """获取当前用户信息"""
+    return UserResponse.model_validate(current_user)
+
+
+@router.put("/profile", response_model=UserResponse)
+def update_profile(
+    data: UserUpdate,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """更新个人资料"""
+    # 修改用户名
+    if data.username and data.username != current_user.username:
+        if db.query(User).filter(User.username == data.username, User.id != current_user.id).first():
+            raise HTTPException(status_code=400, detail="用户名已存在")
+        current_user.username = data.username
+
+    # 修改邮箱
+    if data.email and data.email != current_user.email:
+        if db.query(User).filter(User.email == data.email, User.id != current_user.id).first():
+            raise HTTPException(status_code=400, detail="邮箱已被使用")
+        current_user.email = data.email
+
+    # 修改头像
+    if data.avatar is not None:
+        current_user.avatar = data.avatar
+
+    # 修改密码
+    if data.new_password:
+        if not data.old_password:
+            raise HTTPException(status_code=400, detail="请输入当前密码")
+        if not pwd_context.verify(data.old_password, current_user.password_hash):
+            raise HTTPException(status_code=400, detail="当前密码错误")
+        current_user.password_hash = pwd_context.hash(data.new_password)
+
+    db.commit()
+    db.refresh(current_user)
+    return UserResponse.model_validate(current_user)

backend/routers/bookmarks.py

@@ -0,0 +1,118 @@
+"""网站收藏路由"""
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.orm import Session
+from typing import List
+from database import get_db
+from models.bookmark import BookmarkSite
+from models.user import User
+from schemas.bookmark import BookmarkCreate, BookmarkUpdate, BookmarkResponse, ReorderRequest
+from routers.auth import get_current_user
+
+router = APIRouter()
+
+
+@router.get("", response_model=List[BookmarkResponse])
+def get_bookmarks(
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """获取当前用户的收藏网站列表"""
+    bookmarks = (
+        db.query(BookmarkSite)
+        .filter(BookmarkSite.user_id == current_user.id)
+        .order_by(BookmarkSite.sort_order, BookmarkSite.created_at)
+        .all()
+    )
+    return [BookmarkResponse.model_validate(b) for b in bookmarks]
+
+
+@router.post("", response_model=BookmarkResponse)
+def create_bookmark(
+    data: BookmarkCreate,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """添加收藏网站"""
+    # 获取当前最大排序值
+    max_order = (
+        db.query(BookmarkSite.sort_order)
+        .filter(BookmarkSite.user_id == current_user.id)
+        .order_by(BookmarkSite.sort_order.desc())
+        .first()
+    )
+    next_order = (max_order[0] + 1) if max_order else 0
+
+    bookmark = BookmarkSite(
+        user_id=current_user.id,
+        name=data.name,
+        url=data.url,
+        icon=data.icon,
+        sort_order=next_order,
+    )
+    db.add(bookmark)
+    db.commit()
+    db.refresh(bookmark)
+    return BookmarkResponse.model_validate(bookmark)
+
+
+@router.put("/reorder")
+def reorder_bookmarks(
+    data: ReorderRequest,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """批量更新排序"""
+    for item in data.items:
+        db.query(BookmarkSite).filter(
+            BookmarkSite.id == item.id,
+            BookmarkSite.user_id == current_user.id,
+        ).update({"sort_order": item.sort_order})
+    db.commit()
+    return {"message": "排序已更新"}
+
+
+@router.put("/{bookmark_id}", response_model=BookmarkResponse)
+def update_bookmark(
+    bookmark_id: int,
+    data: BookmarkUpdate,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """编辑收藏网站"""
+    bookmark = db.query(BookmarkSite).filter(
+        BookmarkSite.id == bookmark_id,
+        BookmarkSite.user_id == current_user.id,
+    ).first()
+    if not bookmark:
+        raise HTTPException(status_code=404, detail="收藏不存在")
+
+    if data.name is not None:
+        bookmark.name = data.name
+    if data.url is not None:
+        bookmark.url = data.url
+    if data.icon is not None:
+        bookmark.icon = data.icon
+    if data.sort_order is not None:
+        bookmark.sort_order = data.sort_order
+
+    db.commit()
+    db.refresh(bookmark)
+    return BookmarkResponse.model_validate(bookmark)
+
+
+@router.delete("/{bookmark_id}")
+def delete_bookmark(
+    bookmark_id: int,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """删除收藏网站"""
+    bookmark = db.query(BookmarkSite).filter(
+        BookmarkSite.id == bookmark_id,
+        BookmarkSite.user_id == current_user.id,
+    ).first()
+    if not bookmark:
+        raise HTTPException(status_code=404, detail="收藏不存在")
+    db.delete(bookmark)
+    db.commit()
+    return {"message": "删除成功"}

backend/routers/knowledge_base.py

@@ -0,0 +1,633 @@
+"""团队知识库路由"""
+import json
+import hashlib
+from typing import Optional, List
+from datetime import datetime, timedelta
+from fastapi import APIRouter, Depends, HTTPException, Header, Query
+from fastapi.responses import StreamingResponse
+from sqlalchemy.orm import Session
+from sqlalchemy import func as sa_func, or_
+from pydantic import BaseModel
+
+from database import get_db
+from config import SECRET_KEY
+from models.user import User
+from models.post import Post
+from models.system_config import SystemConfig
+from models.knowledge_base import KbCategory, KbItem, KbAccessLog
+from models.attachment import Attachment
+from routers.auth import get_current_user, get_admin_user
+from services.ai_service import ai_service
+
+router = APIRouter()
+
+
+# ========== 密码机制（复用 API Hub 方案） ==========
+
+def _get_kb_password(db: Session) -> str:
+    cfg = db.query(SystemConfig).filter(SystemConfig.key == "kb_password").first()
+    return cfg.value if cfg else ""
+
+
+def _password_version(db: Session) -> str:
+    """返回密码哈希前8位作为版本标识，密码变更后旧token自动失效"""
+    pwd = _get_kb_password(db)
+    return pwd[:8] if pwd else "none"
+
+
+def _hash_password(pwd: str) -> str:
+    return hashlib.sha256(pwd.encode()).hexdigest()
+
+
+def _create_kb_token(user_id: int, pwd_ver: str = "none") -> str:
+    from jose import jwt
+    exp = datetime.utcnow() + timedelta(hours=2)
+    return jwt.encode({"sub": str(user_id), "kb": True, "pv": pwd_ver, "exp": exp}, SECRET_KEY, algorithm="HS256")
+
+
+def verify_kb_access(
+    x_kb_token: Optional[str] = Header(None),
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """验证用户登录 + 知识库访问令牌"""
+    if not x_kb_token:
+        raise HTTPException(status_code=403, detail="需要知识库访问权限，请先验证密码")
+    from jose import jwt, JWTError
+    try:
+        payload = jwt.decode(x_kb_token, SECRET_KEY, algorithms=["HS256"])
+        if not payload.get("kb"):
+            raise HTTPException(status_code=403, detail="无效的知识库令牌")
+        # 检查密码版本是否匹配
+        token_pv = payload.get("pv", "")
+        current_pv = _password_version(db)
+        if token_pv != current_pv:
+            raise HTTPException(status_code=403, detail="密码已变更，请重新验证")
+    except JWTError:
+        raise HTTPException(status_code=403, detail="知识库令牌已过期，请重新验证密码")
+    return current_user
+
+
+# ========== Schemas ==========
+
+class KbCategoryCreate(BaseModel):
+    name: str
+    icon: str = ""
+
+class KbCategoryUpdate(BaseModel):
+    name: Optional[str] = None
+    icon: Optional[str] = None
+    sort_order: Optional[int] = None
+    is_active: Optional[bool] = None
+
+class KbItemAdd(BaseModel):
+    post_ids: List[int]
+    category_id: Optional[int] = None
+
+class KbItemUpdate(BaseModel):
+    category_id: Optional[int] = None
+    title: Optional[str] = None
+    summary: Optional[str] = None
+    sort_order: Optional[int] = None
+    is_active: Optional[bool] = None
+
+class KbAiChatRequest(BaseModel):
+    question: str
+
+class PasswordBody(BaseModel):
+    password: str
+
+
+# ========== 密码认证接口 ==========
+
+@router.post("/auth")
+def kb_auth(
+    body: PasswordBody,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """知识库密码验证"""
+    stored = _get_kb_password(db)
+    pv = _password_version(db)
+    if not stored:
+        # 未设置密码，直接放行
+        token = _create_kb_token(current_user.id, pv)
+        return {"token": token}
+    if _hash_password(body.password) != stored:
+        raise HTTPException(status_code=401, detail="密码错误")
+    token = _create_kb_token(current_user.id, pv)
+    return {"token": token}
+
+
+@router.get("/check-password")
+def kb_check_password(
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """检查知识库是否需要密码"""
+    stored = _get_kb_password(db)
+    return {"has_password": bool(stored)}
+
+
+# ========== 公开接口（需登录 + kb_token） ==========
+
+@router.get("/categories")
+def get_categories(
+    user: User = Depends(verify_kb_access),
+    db: Session = Depends(get_db),
+):
+    """获取知识库分类列表"""
+    cats = db.query(KbCategory).filter(KbCategory.is_active == True).order_by(KbCategory.sort_order, KbCategory.id).all()
+    result = []
+    for c in cats:
+        count = db.query(sa_func.count(KbItem.id)).filter(KbItem.category_id == c.id, KbItem.is_active == True).scalar() or 0
+        result.append({"id": c.id, "name": c.name, "icon": c.icon, "count": count})
+    return result
+
+
+@router.get("/items")
+def get_items(
+    page: int = Query(1, ge=1),
+    size: int = Query(20, ge=1, le=100),
+    category_id: Optional[int] = None,
+    keyword: Optional[str] = None,
+    user: User = Depends(verify_kb_access),
+    db: Session = Depends(get_db),
+):
+    """获取知识库条目列表"""
+    query = db.query(KbItem).filter(KbItem.is_active == True)
+    if category_id:
+        query = query.filter(KbItem.category_id == category_id)
+    if keyword:
+        kw = f"%{keyword}%"
+        query = query.filter(or_(KbItem.title.like(kw), KbItem.summary.like(kw)))
+    total = query.count()
+    items = query.order_by(KbItem.sort_order, KbItem.created_at.desc()).offset((page - 1) * size).limit(size).all()
+
+    result = []
+    for item in items:
+        post = db.query(Post).filter(Post.id == item.post_id).first()
+        cat = db.query(KbCategory).filter(KbCategory.id == item.category_id).first() if item.category_id else None
+        author = db.query(User).filter(User.id == item.added_by).first() if item.added_by else None
+        result.append({
+            "id": item.id,
+            "title": item.title,
+            "summary": item.summary or (post.content[:150] if post else ""),
+            "category_id": item.category_id,
+            "category_name": cat.name if cat else "",
+            "post_id": item.post_id,
+            "post_author": post.user_id if post else None,
+            "added_by_name": author.username if author else "",
+            "created_at": item.created_at.isoformat() if item.created_at else None,
+        })
+
+    # 记录访问日志
+    if keyword:
+        db.add(KbAccessLog(user_id=user.id, action="search", query=keyword))
+        db.commit()
+
+    return {"items": result, "total": total, "page": page, "size": size}
+
+
+@router.get("/items/{item_id}")
+def get_item_detail(
+    item_id: int,
+    user: User = Depends(verify_kb_access),
+    db: Session = Depends(get_db),
+):
+    """获取知识库条目详情（含帖子完整内容）"""
+    item = db.query(KbItem).filter(KbItem.id == item_id, KbItem.is_active == True).first()
+    if not item:
+        raise HTTPException(status_code=404, detail="条目不存在")
+
+    post = db.query(Post).filter(Post.id == item.post_id).first()
+    cat = db.query(KbCategory).filter(KbCategory.id == item.category_id).first() if item.category_id else None
+    post_author = db.query(User).filter(User.id == post.user_id).first() if post else None
+
+    # 记录访问
+    db.add(KbAccessLog(user_id=user.id, action="view", query=str(item_id)))
+    db.commit()
+
+    return {
+        "id": item.id,
+        "title": item.title,
+        "summary": item.summary,
+        "category_id": item.category_id,
+        "category_name": cat.name if cat else "",
+        "post_id": item.post_id,
+        "post_title": post.title if post else "",
+        "post_content": post.content if post else "",
+        "post_author": {"id": post_author.id, "username": post_author.username} if post_author else None,
+        "post_tags": post.tags if post else "",
+        "post_category": post.category if post else "",
+        "created_at": item.created_at.isoformat() if item.created_at else None,
+        "attachments": [
+            {"id": a.id, "filename": a.filename, "url": a.url, "file_size": a.file_size, "file_type": a.file_type}
+            for a in db.query(Attachment).filter(Attachment.post_id == item.post_id).order_by(Attachment.created_at.asc()).all()
+        ] if post else [],
+    }
+
+
+@router.get("/stats")
+def get_kb_stats(
+    user: User = Depends(verify_kb_access),
+    db: Session = Depends(get_db),
+):
+    """获取知识库统计"""
+    total_items = db.query(sa_func.count(KbItem.id)).filter(KbItem.is_active == True).scalar() or 0
+    total_categories = db.query(sa_func.count(KbCategory.id)).filter(KbCategory.is_active == True).scalar() or 0
+    total_views = db.query(sa_func.count(KbAccessLog.id)).filter(KbAccessLog.action == "view").scalar() or 0
+    total_searches = db.query(sa_func.count(KbAccessLog.id)).filter(KbAccessLog.action == "search").scalar() or 0
+    total_ai_chats = db.query(sa_func.count(KbAccessLog.id)).filter(KbAccessLog.action == "ai_chat").scalar() or 0
+    return {
+        "total_items": total_items,
+        "total_categories": total_categories,
+        "total_views": total_views,
+        "total_searches": total_searches,
+        "total_ai_chats": total_ai_chats,
+    }
+
+
+# ========== AI 智能问答 ==========
+
+KB_AI_SYSTEM_PROMPT = """你是一个团队知识库的AI助手。你的任务是根据知识库中的内容回答用户的问题。
+
+规则：
+1. 只基于提供的知识库内容回答问题，不编造信息
+2. 如果知识库中没有相关内容，诚实告知用户
+3. 回答时引用来源文章的标题
+4. 使用 Markdown 格式组织回答
+5. 回答要简洁、专业、有条理"""
+
+
+@router.post("/ai-chat")
+async def kb_ai_chat(
+    request: KbAiChatRequest,
+    user: User = Depends(verify_kb_access),
+    db: Session = Depends(get_db),
+):
+    """AI 智能问答（SSE 流式）"""
+    question = request.question.strip()
+    if not question:
+        raise HTTPException(status_code=400, detail="请输入问题")
+
+    # 从知识库中检索相关内容作为上下文
+    kw = f"%{question[:50]}%"
+    # 简单关键词匹配（后续可升级为向量搜索）
+    related_items = (
+        db.query(KbItem)
+        .filter(KbItem.is_active == True)
+        .filter(or_(KbItem.title.like(kw), KbItem.summary.like(kw)))
+        .limit(5)
+        .all()
+    )
+
+    # 如果关键词搜索结果不足，补充最新的条目
+    if len(related_items) < 3:
+        existing_ids = [item.id for item in related_items]
+        extra = (
+            db.query(KbItem)
+            .filter(KbItem.is_active == True, ~KbItem.id.in_(existing_ids) if existing_ids else True)
+            .order_by(KbItem.created_at.desc())
+            .limit(10 - len(related_items))
+            .all()
+        )
+        related_items.extend(extra)
+
+    # 构建知识库上下文
+    context_parts = []
+    for item in related_items:
+        post = db.query(Post).filter(Post.id == item.post_id).first()
+        if post:
+            content = post.content[:2000]  # 限制每篇长度
+            context_parts.append(f"### {item.title}\n{content}")
+
+    kb_context = "\n\n---\n\n".join(context_parts) if context_parts else "知识库暂无相关内容。"
+
+    messages = [
+        {"role": "user", "content": f"以下是知识库中的相关内容：\n\n{kb_context}\n\n---\n\n用户问题：{question}"}
+    ]
+
+    # 记录日志
+    db.add(KbAccessLog(user_id=user.id, action="ai_chat", query=question))
+    db.commit()
+
+    # 流式调用AI
+    async def generate():
+        full_response = ""
+        try:
+            result = await ai_service.chat(
+                task_type="reasoning",
+                messages=messages,
+                system_prompt=KB_AI_SYSTEM_PROMPT,
+                stream=True,
+            )
+            if isinstance(result, str):
+                full_response = result
+                yield f"data: {json.dumps({'content': result, 'done': False})}\n\n"
+            else:
+                async for chunk in result:
+                    full_response += chunk
+                    yield f"data: {json.dumps({'content': chunk, 'done': False})}\n\n"
+        except Exception as e:
+            error_msg = f"AI调用出错: {str(e)}"
+            yield f"data: {json.dumps({'content': error_msg, 'done': False})}\n\n"
+
+        yield f"data: {json.dumps({'content': '', 'done': True})}\n\n"
+
+    return StreamingResponse(generate(), media_type="text/event-stream")
+
+
+# ========== 管理员接口 ==========
+
+# --- 密码管理 ---
+
+@router.put("/admin/password")
+def set_kb_password(
+    body: PasswordBody,
+    admin: User = Depends(get_admin_user),
+    db: Session = Depends(get_db),
+):
+    """设置/修改知识库密码"""
+    hashed = _hash_password(body.password) if body.password else ""
+    row = db.query(SystemConfig).filter(SystemConfig.key == "kb_password").first()
+    if row:
+        row.value = hashed
+    else:
+        db.add(SystemConfig(key="kb_password", value=hashed, description="知识库访问密码"))
+    db.commit()
+    return {"message": "密码已更新"}
+
+
+@router.get("/admin/password-status")
+def get_kb_password_status(
+    admin: User = Depends(get_admin_user),
+    db: Session = Depends(get_db),
+):
+    """获取知识库密码状态"""
+    stored = _get_kb_password(db)
+    return {"has_password": bool(stored)}
+
+
+# --- 分类管理 ---
+
+@router.get("/admin/categories")
+def admin_list_categories(
+    admin: User = Depends(get_admin_user),
+    db: Session = Depends(get_db),
+):
+    """获取所有知识库分类（含禁用）"""
+    cats = db.query(KbCategory).order_by(KbCategory.sort_order, KbCategory.id).all()
+    return [
+        {
+            "id": c.id, "name": c.name, "icon": c.icon,
+            "sort_order": c.sort_order, "is_active": c.is_active,
+            "item_count": db.query(sa_func.count(KbItem.id)).filter(KbItem.category_id == c.id).scalar() or 0,
+            "created_at": c.created_at.isoformat() if c.created_at else None,
+        }
+        for c in cats
+    ]
+
+
+@router.post("/admin/categories")
+def admin_create_category(
+    data: KbCategoryCreate,
+    admin: User = Depends(get_admin_user),
+    db: Session = Depends(get_db),
+):
+    """创建知识库分类"""
+    exists = db.query(KbCategory).filter(KbCategory.name == data.name).first()
+    if exists:
+        raise HTTPException(status_code=400, detail="分类名称已存在")
+    cat = KbCategory(name=data.name, icon=data.icon)
+    db.add(cat)
+    db.commit()
+    db.refresh(cat)
+    return {"id": cat.id, "name": cat.name, "message": "创建成功"}
+
+
+@router.put("/admin/categories/{cat_id}")
+def admin_update_category(
+    cat_id: int,
+    data: KbCategoryUpdate,
+    admin: User = Depends(get_admin_user),
+    db: Session = Depends(get_db),
+):
+    """更新知识库分类"""
+    cat = db.query(KbCategory).filter(KbCategory.id == cat_id).first()
+    if not cat:
+        raise HTTPException(status_code=404, detail="分类不存在")
+    updates = data.dict(exclude_none=True)
+    for key, value in updates.items():
+        setattr(cat, key, value)
+    db.commit()
+    return {"message": "更新成功"}
+
+
+@router.delete("/admin/categories/{cat_id}")
+def admin_delete_category(
+    cat_id: int,
+    admin: User = Depends(get_admin_user),
+    db: Session = Depends(get_db),
+):
+    """删除知识库分类"""
+    cat = db.query(KbCategory).filter(KbCategory.id == cat_id).first()
+    if not cat:
+        raise HTTPException(status_code=404, detail="分类不存在")
+    # 将该分类下的条目设为未分类
+    db.query(KbItem).filter(KbItem.category_id == cat_id).update({"category_id": None})
+    db.delete(cat)
+    db.commit()
+    return {"message": "删除成功"}
+
+
+# --- 条目管理 ---
+
+@router.get("/admin/items")
+def admin_list_items(
+    page: int = Query(1, ge=1),
+    size: int = Query(20, ge=1, le=100),
+    category_id: Optional[int] = None,
+    keyword: Optional[str] = None,
+    admin: User = Depends(get_admin_user),
+    db: Session = Depends(get_db),
+):
+    """获取所有知识库条目"""
+    query = db.query(KbItem)
+    if category_id:
+        query = query.filter(KbItem.category_id == category_id)
+    if keyword:
+        kw = f"%{keyword}%"
+        query = query.filter(or_(KbItem.title.like(kw), KbItem.summary.like(kw)))
+    total = query.count()
+    items = query.order_by(KbItem.created_at.desc()).offset((page - 1) * size).limit(size).all()
+
+    result = []
+    for item in items:
+        post = db.query(Post).filter(Post.id == item.post_id).first()
+        cat = db.query(KbCategory).filter(KbCategory.id == item.category_id).first() if item.category_id else None
+        author = db.query(User).filter(User.id == item.added_by).first() if item.added_by else None
+        post_author = db.query(User).filter(User.id == post.user_id).first() if post else None
+        result.append({
+            "id": item.id,
+            "title": item.title,
+            "summary": item.summary or "",
+            "category_id": item.category_id,
+            "category_name": cat.name if cat else "未分类",
+            "post_id": item.post_id,
+            "post_title": post.title if post else "(已删除)",
+            "post_author_name": post_author.username if post_author else "",
+            "added_by_name": author.username if author else "",
+            "is_active": item.is_active,
+            "sort_order": item.sort_order,
+            "created_at": item.created_at.isoformat() if item.created_at else None,
+        })
+    return {"items": result, "total": total, "page": page, "size": size}
+
+
+@router.post("/admin/items")
+def admin_add_items(
+    data: KbItemAdd,
+    admin: User = Depends(get_admin_user),
+    db: Session = Depends(get_db),
+):
+    """从帖子批量添加到知识库"""
+    added = 0
+    skipped = 0
+    for post_id in data.post_ids:
+        # 检查是否已存在
+        exists = db.query(KbItem).filter(KbItem.post_id == post_id).first()
+        if exists:
+            skipped += 1
+            continue
+        post = db.query(Post).filter(Post.id == post_id).first()
+        if not post:
+            skipped += 1
+            continue
+        item = KbItem(
+            post_id=post_id,
+            category_id=data.category_id,
+            title=post.title,
+            summary=post.content[:200] if post.content else "",
+            added_by=admin.id,
+        )
+        db.add(item)
+        added += 1
+    db.commit()
+    return {"message": f"已添加 {added} 条，跳过 {skipped} 条（已存在或不存在）", "added": added, "skipped": skipped}
+
+
+@router.put("/admin/items/{item_id}")
+def admin_update_item(
+    item_id: int,
+    data: KbItemUpdate,
+    admin: User = Depends(get_admin_user),
+    db: Session = Depends(get_db),
+):
+    """更新知识库条目"""
+    item = db.query(KbItem).filter(KbItem.id == item_id).first()
+    if not item:
+        raise HTTPException(status_code=404, detail="条目不存在")
+    updates = data.dict(exclude_none=True)
+    for key, value in updates.items():
+        setattr(item, key, value)
+    db.commit()
+    return {"message": "更新成功"}
+
+
+@router.delete("/admin/items/{item_id}")
+def admin_delete_item(
+    item_id: int,
+    admin: User = Depends(get_admin_user),
+    db: Session = Depends(get_db),
+):
+    """删除知识库条目"""
+    item = db.query(KbItem).filter(KbItem.id == item_id).first()
+    if not item:
+        raise HTTPException(status_code=404, detail="条目不存在")
+    db.delete(item)
+    db.commit()
+    return {"message": "删除成功"}
+
+
+@router.get("/admin/posts-for-pick")
+def admin_posts_for_pick(
+    page: int = Query(1, ge=1),
+    size: int = Query(20, ge=1, le=50),
+    keyword: Optional[str] = None,
+    category: Optional[str] = None,
+    admin: User = Depends(get_admin_user),
+    db: Session = Depends(get_db),
+):
+    """获取可选帖子列表（排除已加入知识库的）"""
+    existing_post_ids = [r[0] for r in db.query(KbItem.post_id).all()]
+    query = db.query(Post).filter(Post.is_public == True)
+    if existing_post_ids:
+        query = query.filter(~Post.id.in_(existing_post_ids))
+    if keyword:
+        kw = f"%{keyword}%"
+        query = query.filter(or_(Post.title.like(kw), Post.content.like(kw)))
+    if category:
+        query = query.filter(Post.category == category)
+    total = query.count()
+    posts = query.order_by(Post.created_at.desc()).offset((page - 1) * size).limit(size).all()
+
+    result = []
+    for p in posts:
+        author = db.query(User).filter(User.id == p.user_id).first()
+        result.append({
+            "id": p.id,
+            "title": p.title,
+            "category": p.category,
+            "content_preview": p.content[:100] if p.content else "",
+            "author_name": author.username if author else "",
+            "like_count": p.like_count,
+            "view_count": p.view_count,
+            "created_at": p.created_at.isoformat() if p.created_at else None,
+        })
+    return {"items": result, "total": total, "page": page, "size": size}
+
+
+# --- 管理员统计 ---
+
+@router.get("/admin/stats")
+def admin_kb_stats(
+    admin: User = Depends(get_admin_user),
+    db: Session = Depends(get_db),
+):
+    """管理员统计数据"""
+    total_items = db.query(sa_func.count(KbItem.id)).scalar() or 0
+    active_items = db.query(sa_func.count(KbItem.id)).filter(KbItem.is_active == True).scalar() or 0
+    total_categories = db.query(sa_func.count(KbCategory.id)).scalar() or 0
+    total_views = db.query(sa_func.count(KbAccessLog.id)).filter(KbAccessLog.action == "view").scalar() or 0
+    total_searches = db.query(sa_func.count(KbAccessLog.id)).filter(KbAccessLog.action == "search").scalar() or 0
+    total_ai_chats = db.query(sa_func.count(KbAccessLog.id)).filter(KbAccessLog.action == "ai_chat").scalar() or 0
+
+    # 最近7天趋势
+    from datetime import date
+    today = date.today()
+    daily_stats = []
+    for i in range(6, -1, -1):
+        d = today - timedelta(days=i)
+        day_start = datetime.combine(d, datetime.min.time())
+        day_end = datetime.combine(d, datetime.max.time())
+        views = db.query(sa_func.count(KbAccessLog.id)).filter(
+            KbAccessLog.action == "view", KbAccessLog.created_at.between(day_start, day_end)
+        ).scalar() or 0
+        searches = db.query(sa_func.count(KbAccessLog.id)).filter(
+            KbAccessLog.action == "search", KbAccessLog.created_at.between(day_start, day_end)
+        ).scalar() or 0
+        ai_chats = db.query(sa_func.count(KbAccessLog.id)).filter(
+            KbAccessLog.action == "ai_chat", KbAccessLog.created_at.between(day_start, day_end)
+        ).scalar() or 0
+        daily_stats.append({"date": d.isoformat(), "views": views, "searches": searches, "ai_chats": ai_chats})
+
+    return {
+        "total_items": total_items,
+        "active_items": active_items,
+        "total_categories": total_categories,
+        "total_views": total_views,
+        "total_searches": total_searches,
+        "total_ai_chats": total_ai_chats,
+        "daily_stats": daily_stats,
+    }

backend/routers/nav.py

@@ -0,0 +1,360 @@
+"""导航站路由"""
+from fastapi import APIRouter, Depends, HTTPException, Query
+from sqlalchemy.orm import Session
+from sqlalchemy import func as sa_func
+from pydantic import BaseModel
+from typing import Optional
+
+from database import get_db
+from models.user import User
+from models.nav_category import NavCategory
+from models.nav_link import NavLink
+from routers.auth import get_current_user, get_admin_user
+
+router = APIRouter()
+
+
+# ========== Schemas ==========
+
+class NavCategoryCreate(BaseModel):
+    name: str
+    icon: str = ""
+
+class NavCategoryUpdate(BaseModel):
+    name: Optional[str] = None
+    icon: Optional[str] = None
+    sort_order: Optional[int] = None
+    is_active: Optional[bool] = None
+
+class NavLinkCreate(BaseModel):
+    category_id: int
+    name: str
+    url: str
+    icon: str = ""
+    description: str = ""
+
+class NavLinkUpdate(BaseModel):
+    category_id: Optional[int] = None
+    name: Optional[str] = None
+    url: Optional[str] = None
+    icon: Optional[str] = None
+    description: Optional[str] = None
+    sort_order: Optional[int] = None
+    is_active: Optional[bool] = None
+
+class NavLinkSubmit(BaseModel):
+    """用户提交导航链接"""
+    category_id: int
+    name: str
+    url: str
+    icon: str = ""
+    description: str = ""
+
+class NavLinkReview(BaseModel):
+    """审核操作"""
+    action: str  # approve / reject
+    reject_reason: str = ""
+
+
+# ========== 管理员接口 ==========
+
+@router.get("/admin/categories")
+def admin_list_categories(
+    db: Session = Depends(get_db),
+    admin: User = Depends(get_admin_user),
+):
+    """获取所有导航分类（含禁用）"""
+    cats = db.query(NavCategory).order_by(NavCategory.sort_order, NavCategory.id).all()
+    return [
+        {
+            "id": c.id, "name": c.name, "icon": c.icon,
+            "sort_order": c.sort_order, "is_active": c.is_active,
+            "link_count": db.query(sa_func.count(NavLink.id)).filter(NavLink.category_id == c.id).scalar() or 0,
+        }
+        for c in cats
+    ]
+
+
+@router.post("/admin/categories")
+def admin_create_category(
+    data: NavCategoryCreate,
+    db: Session = Depends(get_db),
+    admin: User = Depends(get_admin_user),
+):
+    """新增导航分类"""
+    existing = db.query(NavCategory).filter(NavCategory.name == data.name).first()
+    if existing:
+        raise HTTPException(status_code=400, detail="分类名称已存在")
+    max_order = db.query(sa_func.max(NavCategory.sort_order)).scalar() or 0
+    cat = NavCategory(name=data.name, icon=data.icon, sort_order=max_order + 1)
+    db.add(cat)
+    db.commit()
+    db.refresh(cat)
+    return {"id": cat.id, "name": cat.name, "icon": cat.icon, "sort_order": cat.sort_order, "is_active": cat.is_active}
+
+
+@router.put("/admin/categories/{cat_id}")
+def admin_update_category(
+    cat_id: int,
+    data: NavCategoryUpdate,
+    db: Session = Depends(get_db),
+    admin: User = Depends(get_admin_user),
+):
+    """编辑导航分类"""
+    cat = db.query(NavCategory).filter(NavCategory.id == cat_id).first()
+    if not cat:
+        raise HTTPException(status_code=404, detail="分类不存在")
+    if data.name is not None:
+        dup = db.query(NavCategory).filter(NavCategory.name == data.name, NavCategory.id != cat_id).first()
+        if dup:
+            raise HTTPException(status_code=400, detail="分类名称已存在")
+        cat.name = data.name
+    if data.icon is not None:
+        cat.icon = data.icon
+    if data.sort_order is not None:
+        cat.sort_order = data.sort_order
+    if data.is_active is not None:
+        cat.is_active = data.is_active
+    db.commit()
+    db.refresh(cat)
+    return {"id": cat.id, "name": cat.name, "icon": cat.icon, "sort_order": cat.sort_order, "is_active": cat.is_active}
+
+
+@router.delete("/admin/categories/{cat_id}")
+def admin_delete_category(
+    cat_id: int,
+    db: Session = Depends(get_db),
+    admin: User = Depends(get_admin_user),
+):
+    """删除导航分类（级联删除链接）"""
+    cat = db.query(NavCategory).filter(NavCategory.id == cat_id).first()
+    if not cat:
+        raise HTTPException(status_code=404, detail="分类不存在")
+    db.query(NavLink).filter(NavLink.category_id == cat_id).delete()
+    db.delete(cat)
+    db.commit()
+    return {"message": "删除成功"}
+
+
+@router.get("/admin/links")
+def admin_list_links(
+    category_id: Optional[int] = None,
+    status: Optional[str] = None,
+    db: Session = Depends(get_db),
+    admin: User = Depends(get_admin_user),
+):
+    """获取导航链接列表"""
+    query = db.query(NavLink)
+    if category_id is not None:
+        query = query.filter(NavLink.category_id == category_id)
+    if status is not None:
+        query = query.filter(NavLink.status == status)
+    links = query.order_by(NavLink.sort_order, NavLink.id).all()
+    return [
+        {
+            "id": l.id, "category_id": l.category_id, "name": l.name,
+            "url": l.url, "icon": l.icon, "description": l.description,
+            "sort_order": l.sort_order, "is_active": l.is_active,
+            "status": l.status, "submitted_by": l.submitted_by,
+            "reject_reason": l.reject_reason or "",
+        }
+        for l in links
+    ]
+
+
+@router.post("/admin/links")
+def admin_create_link(
+    data: NavLinkCreate,
+    db: Session = Depends(get_db),
+    admin: User = Depends(get_admin_user),
+):
+    """新增导航链接"""
+    cat = db.query(NavCategory).filter(NavCategory.id == data.category_id).first()
+    if not cat:
+        raise HTTPException(status_code=400, detail="分类不存在")
+    max_order = db.query(sa_func.max(NavLink.sort_order)).filter(NavLink.category_id == data.category_id).scalar() or 0
+    link = NavLink(
+        category_id=data.category_id, name=data.name, url=data.url,
+        icon=data.icon, description=data.description, sort_order=max_order + 1,
+    )
+    db.add(link)
+    db.commit()
+    db.refresh(link)
+    return {
+        "id": link.id, "category_id": link.category_id, "name": link.name,
+        "url": link.url, "icon": link.icon, "description": link.description,
+        "sort_order": link.sort_order, "is_active": link.is_active,
+    }
+
+
+@router.put("/admin/links/{link_id}")
+def admin_update_link(
+    link_id: int,
+    data: NavLinkUpdate,
+    db: Session = Depends(get_db),
+    admin: User = Depends(get_admin_user),
+):
+    """编辑导航链接"""
+    link = db.query(NavLink).filter(NavLink.id == link_id).first()
+    if not link:
+        raise HTTPException(status_code=404, detail="链接不存在")
+    if data.category_id is not None:
+        link.category_id = data.category_id
+    if data.name is not None:
+        link.name = data.name
+    if data.url is not None:
+        link.url = data.url
+    if data.icon is not None:
+        link.icon = data.icon
+    if data.description is not None:
+        link.description = data.description
+    if data.sort_order is not None:
+        link.sort_order = data.sort_order
+    if data.is_active is not None:
+        link.is_active = data.is_active
+    db.commit()
+    db.refresh(link)
+    return {
+        "id": link.id, "category_id": link.category_id, "name": link.name,
+        "url": link.url, "icon": link.icon, "description": link.description,
+        "sort_order": link.sort_order, "is_active": link.is_active,
+    }
+
+
+@router.delete("/admin/links/{link_id}")
+def admin_delete_link(
+    link_id: int,
+    db: Session = Depends(get_db),
+    admin: User = Depends(get_admin_user),
+):
+    """删除导航链接"""
+    link = db.query(NavLink).filter(NavLink.id == link_id).first()
+    if not link:
+        raise HTTPException(status_code=404, detail="链接不存在")
+    db.delete(link)
+    db.commit()
+    return {"message": "删除成功"}
+
+
+@router.get("/admin/pending-count")
+def admin_pending_count(
+    db: Session = Depends(get_db),
+    admin: User = Depends(get_admin_user),
+):
+    """获取待审核数量"""
+    count = db.query(sa_func.count(NavLink.id)).filter(NavLink.status == "pending").scalar() or 0
+    return {"count": count}
+
+
+@router.put("/admin/links/{link_id}/review")
+def admin_review_link(
+    link_id: int,
+    data: NavLinkReview,
+    db: Session = Depends(get_db),
+    admin: User = Depends(get_admin_user),
+):
+    """审核导航链接"""
+    link = db.query(NavLink).filter(NavLink.id == link_id).first()
+    if not link:
+        raise HTTPException(status_code=404, detail="链接不存在")
+    if data.action == "approve":
+        link.status = "approved"
+        link.is_active = True
+        link.reject_reason = ""
+    elif data.action == "reject":
+        link.status = "rejected"
+        link.is_active = False
+        link.reject_reason = data.reject_reason
+    else:
+        raise HTTPException(status_code=400, detail="无效操作，请使用 approve 或 reject")
+    db.commit()
+    db.refresh(link)
+    return {
+        "id": link.id, "status": link.status,
+        "is_active": link.is_active, "reject_reason": link.reject_reason or "",
+    }
+
+
+# ========== 用户提交接口 ==========
+
+@router.post("/submit")
+def user_submit_link(
+    data: NavLinkSubmit,
+    db: Session = Depends(get_db),
+    user: User = Depends(get_current_user),
+):
+    """用户提交导航网站（需管理员审核）"""
+    cat = db.query(NavCategory).filter(NavCategory.id == data.category_id).first()
+    if not cat:
+        raise HTTPException(status_code=400, detail="分类不存在")
+    existing = db.query(NavLink).filter(NavLink.url == data.url).first()
+    if existing:
+        raise HTTPException(status_code=400, detail="该网站已被提交过")
+    link = NavLink(
+        category_id=data.category_id, name=data.name, url=data.url,
+        icon=data.icon, description=data.description,
+        status="pending", submitted_by=user.id, is_active=False,
+    )
+    db.add(link)
+    db.commit()
+    db.refresh(link)
+    return {
+        "id": link.id, "name": link.name, "url": link.url,
+        "status": link.status, "message": "提交成功，等待管理员审核",
+    }
+
+
+@router.get("/my-submissions")
+def user_my_submissions(
+    db: Session = Depends(get_db),
+    user: User = Depends(get_current_user),
+):
+    """用户查看自己提交的记录"""
+    links = db.query(NavLink).filter(NavLink.submitted_by == user.id).order_by(NavLink.id.desc()).all()
+    return [
+        {
+            "id": l.id, "name": l.name, "url": l.url, "icon": l.icon,
+            "description": l.description, "status": l.status,
+            "reject_reason": l.reject_reason or "",
+            "created_at": l.created_at.isoformat() if l.created_at else "",
+        }
+        for l in links
+    ]
+
+
+# ========== 公开接口 ==========
+
+@router.get("/public")
+def get_public_nav(
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    """获取所有启用分类及其下启用的链接"""
+    cats = db.query(NavCategory).filter(NavCategory.is_active == True).order_by(NavCategory.sort_order, NavCategory.id).all()
+    result = []
+    for c in cats:
+        links = (
+            db.query(NavLink)
+            .filter(NavLink.category_id == c.id, NavLink.is_active == True, NavLink.status == "approved")
+            .order_by(NavLink.sort_order, NavLink.id)
+            .all()
+        )
+        if links:
+            result.append({
+                "id": c.id, "name": c.name, "icon": c.icon,
+                "links": [
+                    {"id": l.id, "name": l.name, "url": l.url, "icon": l.icon, "description": l.description}
+                    for l in links
+                ],
+            })
+    return result
+
+
+@router.get("/public/categories")
+def get_public_categories(
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    """获取所有启用分类（供用户提交时选择）"""
+    cats = db.query(NavCategory).filter(NavCategory.is_active == True).order_by(NavCategory.sort_order, NavCategory.id).all()
+    return [{"id": c.id, "name": c.name, "icon": c.icon} for c in cats]

backend/routers/notifications.py

@@ -0,0 +1,89 @@
+"""消息通知路由"""
+from fastapi import APIRouter, Depends
+from sqlalchemy.orm import Session
+from sqlalchemy import func
+from database import get_db
+from models.user import User
+from models.notification import Notification
+from routers.auth import get_current_user
+
+router = APIRouter()
+
+
+@router.get("")
+def get_notifications(
+    page: int = 1,
+    page_size: int = 30,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """获取通知列表"""
+    notifs = (
+        db.query(Notification)
+        .filter(Notification.user_id == current_user.id)
+        .order_by(Notification.created_at.desc())
+        .offset((page - 1) * page_size).limit(page_size).all()
+    )
+
+    # 获取触发用户信息
+    from_ids = list(set(n.from_user_id for n in notifs if n.from_user_id))
+    users = db.query(User).filter(User.id.in_(from_ids)).all() if from_ids else []
+    user_map = {u.id: u for u in users}
+
+    return [
+        {
+            "id": n.id,
+            "type": n.type,
+            "content": n.content,
+            "related_id": n.related_id,
+            "is_read": n.is_read,
+            "created_at": n.created_at,
+            "from_user": {
+                "id": n.from_user_id,
+                "username": user_map[n.from_user_id].username,
+                "avatar": user_map[n.from_user_id].avatar,
+            } if n.from_user_id and n.from_user_id in user_map else None,
+        }
+        for n in notifs
+    ]
+
+
+@router.get("/unread-count")
+def get_unread_count(
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """获取未读通知数量"""
+    count = (
+        db.query(func.count(Notification.id))
+        .filter(Notification.user_id == current_user.id, Notification.is_read == False)
+        .scalar()
+    )
+    return {"count": count}
+
+
+@router.put("/read-all")
+def read_all(
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """全部标为已读"""
+    db.query(Notification).filter(
+        Notification.user_id == current_user.id, Notification.is_read == False
+    ).update({"is_read": True})
+    db.commit()
+    return {"message": "已全部标为已读"}
+
+
+@router.put("/{notif_id}/read")
+def read_one(
+    notif_id: int,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """单条标为已读"""
+    db.query(Notification).filter(
+        Notification.id == notif_id, Notification.user_id == current_user.id
+    ).update({"is_read": True})
+    db.commit()
+    return {"message": "已标为已读"}

backend/routers/posts.py

@@ -0,0 +1,440 @@
+"""经验知识库路由"""
+import json
+from typing import List, Optional
+from fastapi import APIRouter, Depends, HTTPException, Query
+from sqlalchemy.orm import Session
+from sqlalchemy import or_
+
+from database import get_db
+from models.user import User
+from models.post import Post
+from models.comment import Comment
+from models.like import Like, Collect
+from models.follow import Follow
+from models.notification import Notification
+from models.attachment import Attachment
+from schemas.post import (
+    PostCreate, PostUpdate, PostResponse, PostListResponse,
+    CommentCreate, CommentResponse,
+)
+from routers.auth import get_current_user
+
+router = APIRouter()
+
+
+import re
+
+
+def _extract_cover_image(content: str) -> str:
+    """从Markdown内容中提取第一张图片作为封面"""
+    if not content:
+        return ""
+    match = re.search(r'!\[.*?\]\((.*?)\)', content)
+    if match:
+        return match.group(1)
+    img_match = re.search(r'<img[^>]+src=["\']([^"\']+)["\']', content)
+    if img_match:
+        return img_match.group(1)
+    return ""
+
+
+def _enrich_post_with_author(post: Post, db: Session) -> dict:
+    """为帖子附加作者信息（用于信息流）"""
+    author = db.query(User).filter(User.id == post.user_id).first()
+    return {
+        "id": post.id, "title": post.title, "content": post.content[:200],
+        "category": post.category, "tags": post.tags,
+        "cover_image": _extract_cover_image(post.content),
+        "view_count": post.view_count, "like_count": post.like_count,
+        "comment_count": post.comment_count, "collect_count": post.collect_count,
+        "created_at": post.created_at, "updated_at": post.updated_at,
+        "author": {
+            "id": post.user_id,
+            "username": author.username if author else "未知",
+            "avatar": author.avatar if author else "",
+        },
+    }
+
+
+@router.get("/feed")
+def get_feed(
+    page: int = 1, page_size: int = 20,
+    category: Optional[str] = None,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """关注的人的帖子流"""
+    following_ids = [f.following_id for f in db.query(Follow.following_id).filter(Follow.follower_id == current_user.id).all()]
+    if not following_ids:
+        return {"items": [], "total": 0, "page": page, "page_size": page_size}
+    query = db.query(Post).filter(Post.user_id.in_(following_ids), Post.is_public == True, Post.is_draft == False)
+    if category:
+        query = query.filter(Post.category == category)
+    total = query.count()
+    posts = (
+        query.order_by(Post.created_at.desc())
+        .offset((page - 1) * page_size).limit(page_size).all()
+    )
+    return {"items": [_enrich_post_with_author(p, db) for p in posts], "total": total, "page": page, "page_size": page_size}
+
+
+@router.get("/hot")
+def get_hot_posts(
+    page: int = 1, page_size: int = 20,
+    category: Optional[str] = None,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """热门帖子（按热度排序）"""
+    query = db.query(Post).filter(Post.is_public == True, Post.is_draft == False)
+    if category:
+        query = query.filter(Post.category == category)
+    total = query.count()
+    posts = (
+        query.order_by((Post.like_count * 3 + Post.comment_count * 2 + Post.view_count).desc())
+        .offset((page - 1) * page_size).limit(page_size).all()
+    )
+    return {"items": [_enrich_post_with_author(p, db) for p in posts], "total": total, "page": page, "page_size": page_size}
+
+
+@router.get("/latest")
+def get_latest_posts(
+    page: int = 1, page_size: int = 20,
+    category: Optional[str] = None,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """最新帖子"""
+    query = db.query(Post).filter(Post.is_public == True, Post.is_draft == False)
+    if category:
+        query = query.filter(Post.category == category)
+    total = query.count()
+    posts = (
+        query.order_by(Post.created_at.desc())
+        .offset((page - 1) * page_size).limit(page_size).all()
+    )
+    return {"items": [_enrich_post_with_author(p, db) for p in posts], "total": total, "page": page, "page_size": page_size}
+
+
+@router.get("/drafts")
+def get_drafts(
+    page: int = 1, page_size: int = 20,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """获取当前用户的草稿列表"""
+    query = db.query(Post).filter(Post.user_id == current_user.id, Post.is_draft == True)
+    total = query.count()
+    posts = query.order_by(Post.updated_at.desc()).offset((page - 1) * page_size).limit(page_size).all()
+    return {
+        "items": [_enrich_post(p, db, current_user.id) for p in posts],
+        "total": total, "page": page, "page_size": page_size,
+    }
+
+
+def _enrich_post(post: Post, db: Session, current_user_id: int = None) -> PostResponse:
+    """填充帖子额外字段"""
+    author = db.query(User).filter(User.id == post.user_id).first()
+    result = PostResponse.model_validate(post)
+    result.author_name = author.username if author else "未知用户"
+    if current_user_id:
+        result.is_liked = db.query(Like).filter(
+            Like.post_id == post.id, Like.user_id == current_user_id
+        ).first() is not None
+        result.is_collected = db.query(Collect).filter(
+            Collect.post_id == post.id, Collect.user_id == current_user_id
+        ).first() is not None
+    return result
+
+
+@router.get("", response_model=PostListResponse)
+def get_posts(
+    page: int = Query(1, ge=1),
+    page_size: int = Query(20, ge=1, le=100),
+    category: Optional[str] = None,
+    tag: Optional[str] = None,
+    user_id: Optional[int] = None,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """获取帖子列表"""
+    query = db.query(Post).filter(
+        or_(Post.is_public == True, Post.user_id == current_user.id),
+        Post.is_draft == False,
+    )
+    if category:
+        query = query.filter(Post.category == category)
+    if tag:
+        query = query.filter(Post.tags.contains(tag))
+    if user_id:
+        query = query.filter(Post.user_id == user_id)
+
+    total = query.count()
+    posts = query.order_by(Post.created_at.desc()).offset((page - 1) * page_size).limit(page_size).all()
+
+    return PostListResponse(
+        items=[_enrich_post(p, db, current_user.id) for p in posts],
+        total=total,
+        page=page,
+        page_size=page_size,
+    )
+
+
+@router.post("", response_model=PostResponse)
+def create_post(
+    data: PostCreate,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """发布经验帖"""
+    post = Post(
+        user_id=current_user.id,
+        title=data.title,
+        content=data.content,
+        category=data.category,
+        tags=json.dumps(data.tags, ensure_ascii=False),
+        is_public=data.is_public,
+        is_draft=data.is_draft,
+    )
+    db.add(post)
+    db.commit()
+    db.refresh(post)
+    return _enrich_post(post, db, current_user.id)
+
+
+@router.get("/{post_id}", response_model=PostResponse)
+def get_post(
+    post_id: int,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """获取帖子详情"""
+    post = db.query(Post).filter(Post.id == post_id).first()
+    if not post:
+        raise HTTPException(status_code=404, detail="帖子不存在")
+    if not post.is_public and post.user_id != current_user.id:
+        raise HTTPException(status_code=403, detail="无权访问")
+
+    # 增加浏览量
+    post.view_count += 1
+    db.commit()
+    db.refresh(post)
+
+    return _enrich_post(post, db, current_user.id)
+
+
+@router.put("/{post_id}", response_model=PostResponse)
+def update_post(
+    post_id: int,
+    data: PostUpdate,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """编辑帖子"""
+    # 管理员可以编辑任意帖子，普通用户只能编辑自己的
+    if current_user.is_admin:
+        post = db.query(Post).filter(Post.id == post_id).first()
+    else:
+        post = db.query(Post).filter(Post.id == post_id, Post.user_id == current_user.id).first()
+    if not post:
+        raise HTTPException(status_code=404, detail="帖子不存在或无权编辑")
+
+    if data.title is not None:
+        post.title = data.title
+    if data.content is not None:
+        post.content = data.content
+    if data.category is not None:
+        post.category = data.category
+    if data.tags is not None:
+        post.tags = json.dumps(data.tags, ensure_ascii=False)
+    if data.is_public is not None:
+        post.is_public = data.is_public
+    if data.is_draft is not None:
+        post.is_draft = data.is_draft
+
+    db.commit()
+    db.refresh(post)
+    return _enrich_post(post, db, current_user.id)
+
+
+@router.delete("/{post_id}")
+def delete_post(
+    post_id: int,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """删除帖子"""
+    post = db.query(Post).filter(Post.id == post_id, Post.user_id == current_user.id).first()
+    if not post:
+        raise HTTPException(status_code=404, detail="帖子不存在或无权删除")
+
+    db.query(Comment).filter(Comment.post_id == post_id).delete()
+    db.query(Like).filter(Like.post_id == post_id).delete()
+    db.query(Collect).filter(Collect.post_id == post_id).delete()
+    db.query(Attachment).filter(Attachment.post_id == post_id).delete()
+    db.delete(post)
+    db.commit()
+    return {"message": "删除成功"}
+
+
+@router.post("/{post_id}/like")
+def toggle_like(
+    post_id: int,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """点赞/取消点赞"""
+    post = db.query(Post).filter(Post.id == post_id).first()
+    if not post:
+        raise HTTPException(status_code=404, detail="帖子不存在")
+
+    existing = db.query(Like).filter(
+        Like.post_id == post_id, Like.user_id == current_user.id
+    ).first()
+
+    if existing:
+        db.delete(existing)
+        post.like_count = max(0, post.like_count - 1)
+        db.commit()
+        return {"liked": False, "like_count": post.like_count}
+    else:
+        db.add(Like(post_id=post_id, user_id=current_user.id))
+        post.like_count += 1
+        # 通知帖子作者
+        if post.user_id != current_user.id:
+            db.add(Notification(
+                user_id=post.user_id, type="like",
+                content=f"{current_user.username} 赞了你的文章「{post.title[:30]}」",
+                from_user_id=current_user.id, related_id=post_id,
+            ))
+        db.commit()
+        return {"liked": True, "like_count": post.like_count}
+
+
+@router.post("/{post_id}/collect")
+def toggle_collect(
+    post_id: int,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """收藏/取消收藏"""
+    post = db.query(Post).filter(Post.id == post_id).first()
+    if not post:
+        raise HTTPException(status_code=404, detail="帖子不存在")
+
+    existing = db.query(Collect).filter(
+        Collect.post_id == post_id, Collect.user_id == current_user.id
+    ).first()
+
+    if existing:
+        db.delete(existing)
+        post.collect_count = max(0, post.collect_count - 1)
+        db.commit()
+        return {"collected": False, "collect_count": post.collect_count}
+    else:
+        db.add(Collect(post_id=post_id, user_id=current_user.id))
+        post.collect_count += 1
+        db.commit()
+        return {"collected": True, "collect_count": post.collect_count}
+
+
+@router.get("/{post_id}/comments", response_model=List[CommentResponse])
+def get_comments(
+    post_id: int,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """获取评论列表"""
+    comments = (
+        db.query(Comment)
+        .filter(Comment.post_id == post_id)
+        .order_by(Comment.created_at.asc())
+        .all()
+    )
+    results = []
+    for c in comments:
+        author = db.query(User).filter(User.id == c.user_id).first()
+        r = CommentResponse.model_validate(c)
+        r.author_name = author.username if author else "未知用户"
+        results.append(r)
+    return results
+
+
+@router.post("/{post_id}/comments", response_model=CommentResponse)
+def create_comment(
+    post_id: int,
+    data: CommentCreate,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """发表评论"""
+    post = db.query(Post).filter(Post.id == post_id).first()
+    if not post:
+        raise HTTPException(status_code=404, detail="帖子不存在")
+
+    comment = Comment(
+        post_id=post_id,
+        user_id=current_user.id,
+        content=data.content,
+    )
+    db.add(comment)
+    post.comment_count += 1
+    # 通知帖子作者
+    if post.user_id != current_user.id:
+        db.add(Notification(
+            user_id=post.user_id, type="comment",
+            content=f"{current_user.username} 评论了你的文章「{post.title[:30]}」",
+            from_user_id=current_user.id, related_id=post_id,
+        ))
+    db.commit()
+    db.refresh(comment)
+
+    result = CommentResponse.model_validate(comment)
+    result.author_name = current_user.username
+    return result
+
+
+@router.get("/{post_id}/attachments")
+def get_attachments(
+    post_id: int,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """获取帖子的附件列表"""
+    attachments = (
+        db.query(Attachment)
+        .filter(Attachment.post_id == post_id)
+        .order_by(Attachment.created_at.asc())
+        .all()
+    )
+    return [
+        {
+            "id": a.id,
+            "filename": a.filename,
+            "url": a.url,
+            "file_size": a.file_size,
+            "file_type": a.file_type,
+            "created_at": a.created_at,
+        }
+        for a in attachments
+    ]
+
+
+@router.delete("/{post_id}/attachments/{attachment_id}")
+def delete_attachment(
+    post_id: int,
+    attachment_id: int,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """删除附件（仅作者）"""
+    attachment = db.query(Attachment).filter(
+        Attachment.id == attachment_id,
+        Attachment.post_id == post_id,
+        Attachment.user_id == current_user.id,
+    ).first()
+    if not attachment:
+        raise HTTPException(status_code=404, detail="附件不存在或无权删除")
+    db.delete(attachment)
+    db.commit()
+    return {"message": "删除成功"}

backend/routers/projects.py

@@ -0,0 +1,410 @@
+"""开源项目路由"""
+import httpx
+from fastapi import APIRouter, Depends, HTTPException, Query
+from sqlalchemy.orm import Session
+from sqlalchemy import func as sa_func, or_
+from pydantic import BaseModel
+from typing import Optional, List
+
+from database import get_db
+from models.user import User
+from models.project import Project
+from models.like import ProjectCollect
+from routers.auth import get_current_user, get_admin_user
+
+router = APIRouter()
+
+GITHUB_API = "https://api.github.com"
+
+
+# ========== Schemas ==========
+
+class ProjectCreate(BaseModel):
+    name: str
+    description: str = ""
+    url: str
+    homepage: str = ""
+    icon: str = ""
+    language: str = ""
+    category: str = ""
+    stars: int = 0
+    forks: int = 0
+
+
+class ProjectUpdate(BaseModel):
+    name: Optional[str] = None
+    description: Optional[str] = None
+    url: Optional[str] = None
+    homepage: Optional[str] = None
+    icon: Optional[str] = None
+    language: Optional[str] = None
+    category: Optional[str] = None
+    stars: Optional[int] = None
+    forks: Optional[int] = None
+    sort_order: Optional[int] = None
+    is_active: Optional[bool] = None
+
+
+def _project_to_dict(p: Project, is_collected: bool = False) -> dict:
+    return {
+        "id": p.id,
+        "name": p.name,
+        "description": p.description or "",
+        "url": p.url,
+        "homepage": p.homepage or "",
+        "icon": p.icon or "",
+        "language": p.language or "",
+        "category": p.category or "",
+        "stars": p.stars or 0,
+        "forks": p.forks or 0,
+        "collect_count": getattr(p, 'collect_count', 0) or 0,
+        "is_collected": is_collected,
+        "sort_order": p.sort_order,
+        "is_active": p.is_active,
+        "created_at": p.created_at.isoformat() if p.created_at else None,
+        "updated_at": p.updated_at.isoformat() if p.updated_at else None,
+    }
+
+
+def _with_collect_status(items: list, user_id: int, db: Session) -> list:
+    """批量查询用户是否已收藏"""
+    if not items:
+        return []
+    project_ids = [p.id for p in items]
+    collected_ids = set(
+        r[0] for r in db.query(ProjectCollect.project_id)
+        .filter(ProjectCollect.project_id.in_(project_ids), ProjectCollect.user_id == user_id)
+        .all()
+    )
+    return [_project_to_dict(p, p.id in collected_ids) for p in items]
+
+
+# ========== 管理员接口 ==========
+
+@router.get("/admin/list")
+def admin_list_projects(
+    page: int = Query(1, ge=1),
+    size: int = Query(20, ge=1, le=100),
+    category: Optional[str] = None,
+    keyword: Optional[str] = None,
+    db: Session = Depends(get_db),
+    admin: User = Depends(get_admin_user),
+):
+    """获取所有项目（含禁用），支持分页"""
+    query = db.query(Project)
+    if category:
+        query = query.filter(Project.category == category)
+    if keyword:
+        kw = f"%{keyword}%"
+        query = query.filter(or_(Project.name.like(kw), Project.description.like(kw)))
+    total = query.count()
+    items = query.order_by(Project.sort_order, Project.id.desc()).offset((page - 1) * size).limit(size).all()
+    return {
+        "total": total,
+        "items": [_project_to_dict(p) for p in items],
+    }
+
+
+@router.post("/admin")
+def admin_create_project(
+    data: ProjectCreate,
+    db: Session = Depends(get_db),
+    admin: User = Depends(get_admin_user),
+):
+    """新增项目"""
+    max_order = db.query(sa_func.max(Project.sort_order)).scalar() or 0
+    proj = Project(
+        name=data.name,
+        description=data.description,
+        url=data.url,
+        homepage=data.homepage,
+        icon=data.icon,
+        language=data.language,
+        category=data.category,
+        stars=data.stars,
+        forks=data.forks,
+        sort_order=max_order + 1,
+    )
+    db.add(proj)
+    db.commit()
+    db.refresh(proj)
+    return _project_to_dict(proj)
+
+
+@router.put("/admin/{project_id}")
+def admin_update_project(
+    project_id: int,
+    data: ProjectUpdate,
+    db: Session = Depends(get_db),
+    admin: User = Depends(get_admin_user),
+):
+    """编辑项目"""
+    proj = db.query(Project).filter(Project.id == project_id).first()
+    if not proj:
+        raise HTTPException(status_code=404, detail="项目不存在")
+    for field in ["name", "description", "url", "homepage", "icon", "language", "category", "stars", "forks", "sort_order", "is_active"]:
+        val = getattr(data, field)
+        if val is not None:
+            setattr(proj, field, val)
+    db.commit()
+    db.refresh(proj)
+    return _project_to_dict(proj)
+
+
+@router.delete("/admin/{project_id}")
+def admin_delete_project(
+    project_id: int,
+    db: Session = Depends(get_db),
+    admin: User = Depends(get_admin_user),
+):
+    """删除项目"""
+    proj = db.query(Project).filter(Project.id == project_id).first()
+    if not proj:
+        raise HTTPException(status_code=404, detail="项目不存在")
+    db.delete(proj)
+    db.commit()
+    return {"message": "删除成功"}
+
+
+# ========== 公开接口 ==========
+
+@router.get("/hot")
+def get_hot_projects(
+    page: int = Query(1, ge=1),
+    size: int = Query(12, ge=1, le=50),
+    category: Optional[str] = None,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    """热门项目（按 stars 降序）"""
+    query = db.query(Project).filter(Project.is_active == True)
+    if category:
+        query = query.filter(Project.category == category)
+    total = query.count()
+    items = query.order_by(Project.stars.desc(), Project.sort_order, Project.id.desc()).offset((page - 1) * size).limit(size).all()
+    return {"total": total, "items": _with_collect_status(items, current_user.id, db)}
+
+
+@router.get("/latest")
+def get_latest_projects(
+    page: int = Query(1, ge=1),
+    size: int = Query(12, ge=1, le=50),
+    category: Optional[str] = None,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    """最新项目（按创建时间降序）"""
+    query = db.query(Project).filter(Project.is_active == True)
+    if category:
+        query = query.filter(Project.category == category)
+    total = query.count()
+    items = query.order_by(Project.created_at.desc(), Project.id.desc()).offset((page - 1) * size).limit(size).all()
+    return {"total": total, "items": _with_collect_status(items, current_user.id, db)}
+
+
+@router.get("/search")
+def search_projects(
+    q: str = Query("", min_length=0),
+    page: int = Query(1, ge=1),
+    size: int = Query(12, ge=1, le=50),
+    category: Optional[str] = None,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    """搜索项目"""
+    query = db.query(Project).filter(Project.is_active == True)
+    if q.strip():
+        kw = f"%{q.strip()}%"
+        query = query.filter(or_(Project.name.like(kw), Project.description.like(kw)))
+    if category:
+        query = query.filter(Project.category == category)
+    total = query.count()
+    items = query.order_by(Project.stars.desc(), Project.id.desc()).offset((page - 1) * size).limit(size).all()
+    return {"total": total, "items": _with_collect_status(items, current_user.id, db)}
+
+
+@router.get("/categories")
+def get_project_categories(
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    """获取所有有项目的分类"""
+    rows = (
+        db.query(Project.category, sa_func.count(Project.id))
+        .filter(Project.is_active == True, Project.category != "")
+        .group_by(Project.category)
+        .order_by(sa_func.count(Project.id).desc())
+        .all()
+    )
+    return [{"name": r[0], "count": r[1]} for r in rows]
+
+
+# ========== 收藏接口 ==========
+
+@router.get("/my-collects")
+def get_my_collects(
+    page: int = Query(1, ge=1),
+    size: int = Query(12, ge=1, le=50),
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    """获取当前用户收藏的项目"""
+    subq = db.query(ProjectCollect.project_id).filter(ProjectCollect.user_id == current_user.id).subquery()
+    query = db.query(Project).filter(Project.id.in_(subq), Project.is_active == True)
+    total = query.count()
+    items = query.order_by(Project.id.desc()).offset((page - 1) * size).limit(size).all()
+    return {"total": total, "items": [_project_to_dict(p, True) for p in items]}
+
+
+@router.post("/{project_id}/collect")
+def toggle_project_collect(
+    project_id: int,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    """收藏/取消收藏项目"""
+    proj = db.query(Project).filter(Project.id == project_id).first()
+    if not proj:
+        raise HTTPException(status_code=404, detail="项目不存在")
+    existing = db.query(ProjectCollect).filter(
+        ProjectCollect.project_id == project_id, ProjectCollect.user_id == current_user.id
+    ).first()
+    if existing:
+        db.delete(existing)
+        proj.collect_count = max(0, (proj.collect_count or 0) - 1)
+        db.commit()
+        return {"collected": False, "collect_count": proj.collect_count}
+    else:
+        db.add(ProjectCollect(project_id=project_id, user_id=current_user.id))
+        proj.collect_count = (proj.collect_count or 0) + 1
+        db.commit()
+        return {"collected": True, "collect_count": proj.collect_count}
+
+
+# ========== GitHub 搜索（公共 + 管理员通用） ==========
+
+async def _github_search_impl(q: str, sort: str, page: int, per_page: int):
+    """GitHub 搜索核心实现"""
+    url = f"{GITHUB_API}/search/repositories"
+    params = {"q": q, "sort": sort, "order": "desc", "page": page, "per_page": per_page}
+    headers = {"Accept": "application/vnd.github+json"}
+    try:
+        async with httpx.AsyncClient(timeout=15) as client:
+            resp = await client.get(url, params=params, headers=headers)
+            if resp.status_code != 200:
+                raise HTTPException(status_code=502, detail=f"GitHub API 返回 {resp.status_code}")
+            data = resp.json()
+    except httpx.TimeoutException:
+        raise HTTPException(status_code=504, detail="GitHub API 请求超时")
+    except httpx.RequestError as e:
+        raise HTTPException(status_code=502, detail=f"网络请求失败: {str(e)}")
+
+    items = []
+    for repo in data.get("items", []):
+        items.append({
+            "github_id": repo["id"],
+            "name": repo.get("name", ""),
+            "full_name": repo.get("full_name", ""),
+            "description": repo.get("description") or "",
+            "url": repo.get("html_url", ""),
+            "homepage": repo.get("homepage") or "",
+            "icon": repo.get("owner", {}).get("avatar_url", ""),
+            "language": repo.get("language") or "",
+            "stars": repo.get("stargazers_count", 0),
+            "forks": repo.get("forks_count", 0),
+            "topics": repo.get("topics", []),
+            "created_at": repo.get("created_at", ""),
+            "updated_at": repo.get("updated_at", ""),
+        })
+    return {"total": data.get("total_count", 0), "items": items}
+
+
+@router.get("/github-search")
+async def public_github_search(
+    q: str = Query(..., min_length=1),
+    sort: str = Query("stars"),
+    page: int = Query(1, ge=1),
+    per_page: int = Query(12, ge=1, le=30),
+    user: User = Depends(get_current_user),
+):
+    """公开 GitHub 搜索（登录用户可用）"""
+    return await _github_search_impl(q, sort, page, per_page)
+
+
+# ========== GitHub 导入接口（管理员） ==========
+
+@router.get("/admin/github-search")
+async def github_search(
+    q: str = Query(..., min_length=1),
+    sort: str = Query("stars"),
+    page: int = Query(1, ge=1),
+    per_page: int = Query(12, ge=1, le=30),
+    admin: User = Depends(get_admin_user),
+):
+    """管理员 GitHub 搜索"""
+    return await _github_search_impl(q, sort, page, per_page)
+
+
+class GitHubImportItem(BaseModel):
+    name: str
+    description: str = ""
+    url: str
+    homepage: str = ""
+    icon: str = ""
+    language: str = ""
+    category: str = ""
+    stars: int = 0
+    forks: int = 0
+
+
+class GitHubImportRequest(BaseModel):
+    items: List[GitHubImportItem]
+
+
+@router.post("/admin/github-import")
+def github_import(
+    data: GitHubImportRequest,
+    db: Session = Depends(get_db),
+    admin: User = Depends(get_admin_user),
+):
+    """批量导入 GitHub 项目"""
+    imported = 0
+    skipped = 0
+    max_order = db.query(sa_func.max(Project.sort_order)).scalar() or 0
+    for item in data.items:
+        existing = db.query(Project).filter(Project.url == item.url).first()
+        if existing:
+            skipped += 1
+            continue
+        max_order += 1
+        proj = Project(
+            name=item.name,
+            description=item.description,
+            url=item.url,
+            homepage=item.homepage,
+            icon=item.icon,
+            language=item.language,
+            category=item.category,
+            stars=item.stars,
+            forks=item.forks,
+            sort_order=max_order,
+        )
+        db.add(proj)
+        imported += 1
+    db.commit()
+    return {"imported": imported, "skipped": skipped}
+
+
+# ========== 项目详情（通配路由放最后） ==========
+
+@router.get("/{project_id}")
+def get_project_detail(
+    project_id: int,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    """项目详情"""
+    proj = db.query(Project).filter(Project.id == project_id, Project.is_active == True).first()
+    if not proj:
+        raise HTTPException(status_code=404, detail="项目不存在")
+    return _project_to_dict(proj)

backend/routers/requirement.py

@@ -0,0 +1,313 @@
+"""需求理解助手路由"""
+import json
+import os
+import uuid
+from typing import List
+from fastapi import APIRouter, Depends, HTTPException, UploadFile, File, Form
+from fastapi.responses import StreamingResponse
+from sqlalchemy.orm import Session
+
+from database import get_db
+from models.user import User
+from models.conversation import Conversation, Message
+from schemas.conversation import (
+    RequirementAnalyzeRequest, ConversationResponse,
+    ConversationDetail, MessageResponse,
+)
+from routers.auth import get_current_user
+from services.ai_service import ai_service
+from config import UPLOAD_DIR
+
+router = APIRouter()
+
+REQUIREMENT_SYSTEM_PROMPT = """# 角色定义
+你同时具备两个身份：
+1. **资深产品经理（10年+）**：擅长从模糊信息中提炼需求本质，精通用户故事、MECE拆解、优先级排序、验收标准制定
+2. **高级全栈程序员（10年+）**：做过大量项目，对功能的复杂度、开发工作量有精准直觉，能一眼看出哪些需求是"看似简单实则巨坑"
+
+你服务的对象是**程序员**，他们会把甲方发来的原始内容（口语化描述、语音转文字、截图、聊天记录、需求文档等）发给你。你需要站在「既懂业务又懂技术」的双重视角，将其转化为**清晰明确、可直接进入开发的结构化需求**。
+
+> ⚠️ 本助手专注于**需求理解与分析**。技术选型、数据库设计、API设计、架构方案等请移步「架构选型AI助手」。
+
+# 核心理念
+- **需求层面**：甲方说的不一定是他真正想要的，你要透过表面描述挖掘真实诉求
+- **程序员直觉**：每个功能你都要心里过一遍复杂度，标注哪些"看起来简单但实际很复杂"
+- **落地导向**：不出空中楼阁式的分析，每条功能都要能对应到具体的开发任务
+
+# 分析框架
+收到用户输入后，按以下框架进行系统性分析：
+
+## 第一步：需求还原（产品经理视角）
+- 理解甲方的**核心意图**：到底想解决什么问题？服务什么业务场景？
+- 识别**目标用户**是谁，使用频率、核心使用路径是什么
+- 区分"真实需求"与"表面描述"，找出甲方没说但一定需要的**隐性需求**
+- 判断产品定位：工具型/平台型/内容型？ToB/ToC？
+
+## 第二步：功能拆解（遵循 MECE 原则）
+将需求拆解为相互独立、完全穷尽的功能模块，每个功能需包含：
+- 功能名称 + 具体说明
+- 优先级（P0 核心必做 / P1 重要 / P2 锦上添花）
+- 涉及的用户角色
+- 复杂度预判（简单/中等/复杂）+ 复杂原因说明
+
+## 第三步：用户故事与验收标准
+将核心功能转写为标准用户故事：
+> 作为【角色】，我希望【功能】，以便【价值/目的】
+
+为 P0 功能补充验收标准（AC），采用 Given-When-Then 格式：
+> 假设【前置条件】，当【用户操作】，那么【系统响应】
+
+## 第四步：复杂度预警（程序员视角）
+基于你做过大量项目的经验，标注：
+- **隐藏复杂度**：哪些功能看似简单但实现起来有坑（如"支持实时聊天"看似一句话，实际涉及WebSocket、消息队列、已读回执等）
+- **高风险功能**：涉及支付、权限、数据一致性等需要特别慎重的功能
+- **工期杀手**：容易严重超出预期工时的功能，提前预警
+- **工期粗估**：按模块给出大致工时范围（x-x天），帮助程序员评估排期
+
+## 第五步：边界与待确认项
+- 需求中**含糊不清**需要甲方确认的关键问题
+- 容易遗漏的**边缘场景**（空状态、异常流、权限边界、数据量极值、并发操作）
+- 甲方可能还没想到但**一定会追加**的需求（基于经验预判）
+
+# 输出规范
+严格使用以下 Markdown 结构输出：
+
+---
+
+## 📋 需求概述
+> 用2-3句话概括：这是什么产品/功能，解决谁的什么问题，核心价值是什么。
+> 产品定位：【工具型/平台型/内容型】 | 【ToB/ToC】
+
+## 👥 用户角色
+| 角色 | 说明 | 关键诉求 | 使用频率 |
+|------|------|---------|---------|
+
+## 🧩 功能清单
+| 优先级 | 模块 | 功能项 | 功能说明 | 涉及角色 | 复杂度 |
+|--------|------|--------|---------|---------|--------|
+| P0 | xxx | xxx | xxx | xxx | 🔴复杂 - 原因 |
+| P0 | xxx | xxx | xxx | xxx | 🟢简单 |
+| P1 | xxx | xxx | xxx | xxx | 🟡中等 |
+
+## 📖 核心用户故事与验收标准
+### US-1: 【用户故事标题】
+- **故事**：作为【角色】，我希望【功能】，以便【价值】
+- **验收标准**：
+  - ✅ 假设【条件】，当【操作】，那么【预期结果】
+  - ✅ 假设【条件】，当【异常操作】，那么【兜底处理】
+
+## ⚡ 复杂度预警（程序员必看）
+### 🔴 隐藏复杂度
+1. **【功能名】**：看似xxx，实际需要xxx，建议xxx
+
+### ⏱️ 工期粗估
+| 模块 | 工时范围 | 说明 |
+|------|---------|------|
+| 合计 | x-x天 | 基于1名全栈开发者，含开发+自测 |
+
+### 🔮 甲方大概率会追加的需求
+1. 【需求名】— 理由：基于经验，做了xxx之后甲方通常会要求xxx
+
+## ❓ 待确认问题
+> 以下问题会直接影响开发方案，建议优先与甲方确认：
+1. **【问题】**：【为什么需要确认】→ 不确认的影响：【xxx】
+
+## 💡 风险提示
+- 【业务风险、边缘场景、容易遗漏的点等】
+
+---
+
+> 💡 **下一步建议**：需求确认后，可将功能清单发送至「架构选型AI助手」，获取技术选型、数据库设计、API接口设计等技术方案。
+
+# 交互原则
+1. **首次分析要全面**：即使信息不完整，也要基于已有信息给出最完整的分析，用待确认问题标注不确定的部分
+2. **复杂度标注要诚实**：程序员最怕"这个很简单"，要如实标注复杂度和潜在的坑
+3. **追问要有价值**：只追问影响开发方案的关键问题，不问显而易见的
+4. **语言贴近程序员**：用开发者能直接理解的术语，避免纯商业话术
+5. **持续迭代**：用户补充信息后，在之前分析的基础上更新完善，而非重头开始
+6. **务实不空谈**：每条建议都基于实际经验，不说"建议优化用户体验"这类空话
+7. **工时要诚实**：给出合理区间，标注不确定因素"""
+
+
+@router.post("/upload-image")
+async def upload_image(
+    file: UploadFile = File(...),
+    current_user: User = Depends(get_current_user),
+):
+    """上传图片"""
+    # 验证文件类型
+    allowed_types = ["image/jpeg", "image/png", "image/gif", "image/webp"]
+    if file.content_type not in allowed_types:
+        raise HTTPException(status_code=400, detail="不支持的文件类型")
+
+    # 生成唯一文件名
+    ext = file.filename.split(".")[-1] if "." in file.filename else "png"
+    filename = f"{uuid.uuid4().hex}.{ext}"
+    filepath = os.path.join(UPLOAD_DIR, filename)
+
+    # 保存文件
+    content = await file.read()
+    with open(filepath, "wb") as f:
+        f.write(content)
+
+    return {"url": f"/uploads/{filename}"}
+
+
+@router.get("/conversations", response_model=List[ConversationResponse])
+def get_conversations(
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """获取需求对话列表"""
+    conversations = (
+        db.query(Conversation)
+        .filter(Conversation.user_id == current_user.id, Conversation.type == "requirement")
+        .order_by(Conversation.updated_at.desc())
+        .all()
+    )
+    return [ConversationResponse.model_validate(c) for c in conversations]
+
+
+@router.get("/conversations/{conversation_id}", response_model=ConversationDetail)
+def get_conversation_detail(
+    conversation_id: int,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """获取对话详情"""
+    conv = db.query(Conversation).filter(
+        Conversation.id == conversation_id,
+        Conversation.user_id == current_user.id,
+    ).first()
+    if not conv:
+        raise HTTPException(status_code=404, detail="对话不存在")
+
+    messages = (
+        db.query(Message)
+        .filter(Message.conversation_id == conversation_id)
+        .order_by(Message.created_at.asc())
+        .all()
+    )
+    result = ConversationDetail.model_validate(conv)
+    result.messages = [MessageResponse.model_validate(m) for m in messages]
+    return result
+
+
+@router.post("/analyze")
+async def analyze_requirement(
+    request: RequirementAnalyzeRequest,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """分析需求 - 流式输出"""
+    # 创建或获取对话
+    if request.conversation_id:
+        conv = db.query(Conversation).filter(
+            Conversation.id == request.conversation_id,
+            Conversation.user_id == current_user.id,
+        ).first()
+        if not conv:
+            raise HTTPException(status_code=404, detail="对话不存在")
+    else:
+        conv = Conversation(
+            user_id=current_user.id,
+            title=request.content[:50] if request.content else "新需求分析",
+            type="requirement",
+        )
+        db.add(conv)
+        db.commit()
+        db.refresh(conv)
+
+    # 保存用户消息
+    user_msg = Message(
+        conversation_id=conv.id,
+        role="user",
+        content=request.content,
+        image_urls=json.dumps(request.image_urls) if request.image_urls else "",
+    )
+    db.add(user_msg)
+    db.commit()
+
+    # 构建历史消息
+    history_msgs = (
+        db.query(Message)
+        .filter(Message.conversation_id == conv.id)
+        .order_by(Message.created_at.asc())
+        .all()
+    )
+
+    messages = []
+    for msg in history_msgs:
+        if msg.role == "user":
+            content = msg.content
+            # 如果有图片，添加图片描述提示
+            if msg.image_urls:
+                try:
+                    urls = json.loads(msg.image_urls)
+                    if urls:
+                        content += f"\n\n[用户上传了{len(urls)}张图片]"
+                except json.JSONDecodeError:
+                    pass
+            messages.append({"role": "user", "content": content})
+        else:
+            messages.append({"role": "assistant", "content": msg.content})
+
+    # 确定任务类型
+    task_type = "multimodal" if request.image_urls else "reasoning"
+
+    # 流式调用AI
+    async def generate():
+        full_response = ""
+        try:
+            result = await ai_service.chat(
+                task_type=task_type,
+                messages=messages,
+                system_prompt=REQUIREMENT_SYSTEM_PROMPT,
+                stream=True,
+                model_config_id=request.model_config_id,
+            )
+            if isinstance(result, str):
+                # 非流式返回
+                full_response = result
+                yield f"data: {json.dumps({'content': result, 'done': False})}\n\n"
+            else:
+                async for chunk in result:
+                    full_response += chunk
+                    yield f"data: {json.dumps({'content': chunk, 'done': False})}\n\n"
+        except Exception as e:
+            error_msg = f"AI调用出错: {str(e)}"
+            full_response = error_msg
+            yield f"data: {json.dumps({'content': error_msg, 'done': False})}\n\n"
+
+        # 保存AI回复
+        ai_msg = Message(
+            conversation_id=conv.id,
+            role="assistant",
+            content=full_response,
+        )
+        db.add(ai_msg)
+        db.commit()
+
+        yield f"data: {json.dumps({'content': '', 'done': True, 'conversation_id': conv.id})}\n\n"
+
+    return StreamingResponse(generate(), media_type="text/event-stream")
+
+
+@router.delete("/conversations/{conversation_id}")
+def delete_conversation(
+    conversation_id: int,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """删除对话"""
+    conv = db.query(Conversation).filter(
+        Conversation.id == conversation_id,
+        Conversation.user_id == current_user.id,
+    ).first()
+    if not conv:
+        raise HTTPException(status_code=404, detail="对话不存在")
+
+    db.query(Message).filter(Message.conversation_id == conversation_id).delete()
+    db.delete(conv)
+    db.commit()
+    return {"message": "删除成功"}

backend/routers/search.py

@@ -0,0 +1,47 @@
+"""搜索路由"""
+from typing import Optional
+from fastapi import APIRouter, Depends, Query
+from sqlalchemy.orm import Session
+from sqlalchemy import or_
+
+from database import get_db
+from models.user import User
+from models.post import Post
+from schemas.post import PostResponse, PostListResponse
+from routers.auth import get_current_user
+from routers.posts import _enrich_post
+
+router = APIRouter()
+
+
+@router.get("", response_model=PostListResponse)
+def search_posts(
+    q: str = Query(..., min_length=1, description="搜索关键词"),
+    category: Optional[str] = None,
+    page: int = Query(1, ge=1),
+    page_size: int = Query(20, ge=1, le=100),
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """全文搜索帖子"""
+    query = db.query(Post).filter(
+        or_(Post.is_public == True, Post.user_id == current_user.id),
+        or_(
+            Post.title.contains(q),
+            Post.content.contains(q),
+            Post.tags.contains(q),
+        ),
+    )
+
+    if category:
+        query = query.filter(Post.category == category)
+
+    total = query.count()
+    posts = query.order_by(Post.created_at.desc()).offset((page - 1) * page_size).limit(page_size).all()
+
+    return PostListResponse(
+        items=[_enrich_post(p, db, current_user.id) for p in posts],
+        total=total,
+        page=page,
+        page_size=page_size,
+    )

backend/routers/shared_api.py

@@ -0,0 +1,526 @@
+"""共享API Hub路由"""
+from fastapi import APIRouter, Depends, HTTPException, Header, Request
+from sqlalchemy.orm import Session
+from sqlalchemy import func as sa_func
+from pydantic import BaseModel
+from typing import Optional
+from datetime import datetime, timedelta
+import time
+import hashlib
+
+from database import get_db
+from config import SECRET_KEY
+from models.user import User
+from models.system_config import SystemConfig
+from models.shared_api import SharedApiCategory, SharedApi, SharedApiLog
+from routers.auth import get_current_user, get_admin_user
+
+router = APIRouter()
+
+# ========== 加密工具 ==========
+
+_fernet = None
+
+def _get_fernet():
+    global _fernet
+    if _fernet is None:
+        from cryptography.fernet import Fernet
+        import base64
+        # 从SECRET_KEY派生一个Fernet兼容的key
+        key = hashlib.sha256(SECRET_KEY.encode()).digest()
+        _fernet = Fernet(base64.urlsafe_b64encode(key))
+    return _fernet
+
+def encrypt_key(plain: str) -> str:
+    if not plain:
+        return ""
+    return _get_fernet().encrypt(plain.encode()).decode()
+
+def decrypt_key(encrypted: str) -> str:
+    if not encrypted:
+        return ""
+    try:
+        return _get_fernet().decrypt(encrypted.encode()).decode()
+    except Exception:
+        return ""
+
+def mask_key(encrypted: str) -> str:
+    """脱敏显示"""
+    plain = decrypt_key(encrypted)
+    if not plain:
+        return ""
+    if len(plain) <= 8:
+        return plain[:2] + "***"
+    return plain[:4] + "****" + plain[-4:]
+
+
+# ========== Hub访问密码机制 ==========
+
+def _get_hub_password(db: Session) -> str:
+    cfg = db.query(SystemConfig).filter(SystemConfig.key == "api_hub_password").first()
+    return cfg.value if cfg else ""
+
+def _hub_password_version(db: Session) -> str:
+    """返回密码哈希前8位作为版本标识，密码变更后旧token自动失效"""
+    pwd = _get_hub_password(db)
+    return pwd[:8] if pwd else "none"
+
+def _hash_password(pwd: str) -> str:
+    return hashlib.sha256(pwd.encode()).hexdigest()
+
+def _create_hub_token(user_id: int, pwd_ver: str = "none") -> str:
+    """创建Hub访问令牌（简单签名，2小时有效）"""
+    from jose import jwt
+    exp = datetime.utcnow() + timedelta(hours=2)
+    return jwt.encode({"sub": str(user_id), "hub": True, "pv": pwd_ver, "exp": exp}, SECRET_KEY, algorithm="HS256")
+
+def verify_hub_access(
+    x_hub_token: Optional[str] = Header(None),
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """验证用户登录 + Hub访问令牌"""
+    if not x_hub_token:
+        raise HTTPException(status_code=403, detail="需要API Hub访问权限，请先验证密码")
+    from jose import jwt, JWTError
+    try:
+        payload = jwt.decode(x_hub_token, SECRET_KEY, algorithms=["HS256"])
+        if not payload.get("hub"):
+            raise HTTPException(status_code=403, detail="无效的Hub令牌")
+        # 检查密码版本是否匹配
+        token_pv = payload.get("pv", "")
+        current_pv = _hub_password_version(db)
+        if token_pv != current_pv:
+            raise HTTPException(status_code=403, detail="密码已变更，请重新验证")
+    except JWTError:
+        raise HTTPException(status_code=403, detail="Hub令牌已过期，请重新验证密码")
+    return current_user
+
+
+# ========== Schemas ==========
+
+class HubAuthRequest(BaseModel):
+    password: str
+
+class CategoryCreate(BaseModel):
+    name: str
+    icon: str = ""
+
+class CategoryUpdate(BaseModel):
+    name: Optional[str] = None
+    icon: Optional[str] = None
+    sort_order: Optional[int] = None
+    is_active: Optional[bool] = None
+
+class ApiCreate(BaseModel):
+    category_id: Optional[int] = None
+    name: str
+    description: str = ""
+    base_url: str = ""
+    doc_url: str = ""
+    auth_type: str = "none"
+    api_key: str = ""  # 明文传入，后端加密存储
+    api_key_header: str = "Authorization"
+    health_check_url: str = ""
+    tags: str = ""
+
+class ApiUpdate(BaseModel):
+    category_id: Optional[int] = None
+    name: Optional[str] = None
+    description: Optional[str] = None
+    base_url: Optional[str] = None
+    doc_url: Optional[str] = None
+    auth_type: Optional[str] = None
+    api_key: Optional[str] = None
+    api_key_header: Optional[str] = None
+    health_check_url: Optional[str] = None
+    tags: Optional[str] = None
+    is_active: Optional[bool] = None
+
+class ApiTestRequest(BaseModel):
+    method: str = "GET"
+    path: str = ""
+    body: str = ""
+    headers: dict = {}
+
+
+# ========== 密码认证接口 ==========
+
+@router.post("/auth")
+def hub_auth(
+    data: HubAuthRequest,
+    db: Session = Depends(get_db),
+    user: User = Depends(get_current_user),
+):
+    """验证Hub访问密码"""
+    stored = _get_hub_password(db)
+    if not stored:
+        raise HTTPException(status_code=400, detail="管理员尚未设置访问密码")
+    if _hash_password(data.password) != stored:
+        raise HTTPException(status_code=403, detail="密码错误")
+    token = _create_hub_token(user.id, _hub_password_version(db))
+    return {"hub_token": token, "expires_in": 7200}
+
+@router.get("/check-password")
+def check_password_set(
+    db: Session = Depends(get_db),
+    user: User = Depends(get_current_user),
+):
+    """检查是否已设置访问密码"""
+    stored = _get_hub_password(db)
+    return {"has_password": bool(stored)}
+
+@router.put("/admin/password")
+def set_hub_password(
+    data: HubAuthRequest,
+    db: Session = Depends(get_db),
+    admin: User = Depends(get_admin_user),
+):
+    """管理员设置Hub访问密码"""
+    if len(data.password) < 4:
+        raise HTTPException(status_code=400, detail="密码至少4位")
+    hashed = _hash_password(data.password)
+    cfg = db.query(SystemConfig).filter(SystemConfig.key == "api_hub_password").first()
+    if cfg:
+        cfg.value = hashed
+    else:
+        cfg = SystemConfig(key="api_hub_password", value=hashed, description="API Hub访问密码")
+        db.add(cfg)
+    db.commit()
+    return {"message": "密码设置成功"}
+
+@router.get("/admin/password-status")
+def get_password_status(
+    db: Session = Depends(get_db),
+    admin: User = Depends(get_admin_user),
+):
+    """管理员查看密码是否已设置"""
+    stored = _get_hub_password(db)
+    return {"has_password": bool(stored)}
+
+
+# ========== 分类管理 ==========
+
+@router.get("/categories")
+def list_categories(
+    db: Session = Depends(get_db),
+    user: User = Depends(verify_hub_access),
+):
+    cats = db.query(SharedApiCategory).order_by(SharedApiCategory.sort_order, SharedApiCategory.id).all()
+    return [
+        {"id": c.id, "name": c.name, "icon": c.icon, "sort_order": c.sort_order, "is_active": c.is_active,
+         "api_count": db.query(sa_func.count(SharedApi.id)).filter(SharedApi.category_id == c.id).scalar() or 0}
+        for c in cats
+    ]
+
+@router.post("/categories")
+def create_category(
+    data: CategoryCreate,
+    db: Session = Depends(get_db),
+    user: User = Depends(verify_hub_access),
+):
+    existing = db.query(SharedApiCategory).filter(SharedApiCategory.name == data.name).first()
+    if existing:
+        raise HTTPException(status_code=400, detail="分类名称已存在")
+    max_order = db.query(sa_func.max(SharedApiCategory.sort_order)).scalar() or 0
+    cat = SharedApiCategory(name=data.name, icon=data.icon, sort_order=max_order + 1)
+    db.add(cat)
+    db.commit()
+    db.refresh(cat)
+    return {"id": cat.id, "name": cat.name, "icon": cat.icon}
+
+@router.put("/categories/{cat_id}")
+def update_category(
+    cat_id: int,
+    data: CategoryUpdate,
+    db: Session = Depends(get_db),
+    user: User = Depends(verify_hub_access),
+):
+    cat = db.query(SharedApiCategory).filter(SharedApiCategory.id == cat_id).first()
+    if not cat:
+        raise HTTPException(status_code=404, detail="分类不存在")
+    if data.name is not None:
+        cat.name = data.name
+    if data.icon is not None:
+        cat.icon = data.icon
+    if data.sort_order is not None:
+        cat.sort_order = data.sort_order
+    if data.is_active is not None:
+        cat.is_active = data.is_active
+    db.commit()
+    return {"message": "更新成功"}
+
+@router.delete("/categories/{cat_id}")
+def delete_category(
+    cat_id: int,
+    db: Session = Depends(get_db),
+    user: User = Depends(verify_hub_access),
+):
+    cat = db.query(SharedApiCategory).filter(SharedApiCategory.id == cat_id).first()
+    if not cat:
+        raise HTTPException(status_code=404, detail="分类不存在")
+    # 将该分类下的API设为未分类
+    db.query(SharedApi).filter(SharedApi.category_id == cat_id).update({SharedApi.category_id: None})
+    db.delete(cat)
+    db.commit()
+    return {"message": "删除成功"}
+
+
+# ========== API CRUD ==========
+
+def _api_to_dict(api, db=None):
+    d = {
+        "id": api.id, "category_id": api.category_id,
+        "name": api.name, "description": api.description,
+        "base_url": api.base_url, "doc_url": api.doc_url,
+        "auth_type": api.auth_type,
+        "api_key_masked": mask_key(api.api_key_encrypted),
+        "api_key_plain": decrypt_key(api.api_key_encrypted) if api.api_key_encrypted else "",
+        "has_api_key": bool(api.api_key_encrypted),
+        "api_key_header": api.api_key_header,
+        "health_check_url": api.health_check_url,
+        "last_check_time": api.last_check_time.isoformat() if api.last_check_time else None,
+        "last_check_status": api.last_check_status,
+        "added_by": api.added_by, "tags": api.tags,
+        "call_count": api.call_count, "is_active": api.is_active,
+        "created_at": api.created_at.isoformat() if api.created_at else None,
+        "updated_at": api.updated_at.isoformat() if api.updated_at else None,
+    }
+    return d
+
+@router.get("/list")
+def list_apis(
+    keyword: Optional[str] = None,
+    category_id: Optional[int] = None,
+    db: Session = Depends(get_db),
+    user: User = Depends(verify_hub_access),
+):
+    query = db.query(SharedApi).filter(SharedApi.is_active == True)
+    if keyword:
+        kw = f"%{keyword}%"
+        query = query.filter(
+            (SharedApi.name.like(kw)) | (SharedApi.description.like(kw)) | (SharedApi.tags.like(kw))
+        )
+    if category_id is not None:
+        query = query.filter(SharedApi.category_id == category_id)
+    apis = query.order_by(SharedApi.call_count.desc(), SharedApi.id.desc()).all()
+    return {"items": [_api_to_dict(a) for a in apis], "total": len(apis)}
+
+@router.post("/")
+def create_api(
+    data: ApiCreate,
+    db: Session = Depends(get_db),
+    user: User = Depends(verify_hub_access),
+):
+    api = SharedApi(
+        category_id=data.category_id, name=data.name, description=data.description,
+        base_url=data.base_url, doc_url=data.doc_url,
+        auth_type=data.auth_type,
+        api_key_encrypted=encrypt_key(data.api_key) if data.api_key else "",
+        api_key_header=data.api_key_header,
+        health_check_url=data.health_check_url,
+        tags=data.tags, added_by=user.id,
+    )
+    db.add(api)
+    db.commit()
+    db.refresh(api)
+    return _api_to_dict(api)
+
+@router.put("/{api_id}")
+def update_api(
+    api_id: int,
+    data: ApiUpdate,
+    db: Session = Depends(get_db),
+    user: User = Depends(verify_hub_access),
+):
+    api = db.query(SharedApi).filter(SharedApi.id == api_id).first()
+    if not api:
+        raise HTTPException(status_code=404, detail="API不存在")
+    if data.category_id is not None:
+        api.category_id = data.category_id
+    if data.name is not None:
+        api.name = data.name
+    if data.description is not None:
+        api.description = data.description
+    if data.base_url is not None:
+        api.base_url = data.base_url
+    if data.doc_url is not None:
+        api.doc_url = data.doc_url
+    if data.auth_type is not None:
+        api.auth_type = data.auth_type
+    if data.api_key is not None and data.api_key != "":
+        api.api_key_encrypted = encrypt_key(data.api_key)
+    if data.api_key_header is not None:
+        api.api_key_header = data.api_key_header
+    if data.health_check_url is not None:
+        api.health_check_url = data.health_check_url
+    if data.tags is not None:
+        api.tags = data.tags
+    if data.is_active is not None:
+        api.is_active = data.is_active
+    db.commit()
+    db.refresh(api)
+    return _api_to_dict(api)
+
+@router.delete("/{api_id}")
+def delete_api(
+    api_id: int,
+    db: Session = Depends(get_db),
+    user: User = Depends(verify_hub_access),
+):
+    api = db.query(SharedApi).filter(SharedApi.id == api_id).first()
+    if not api:
+        raise HTTPException(status_code=404, detail="API不存在")
+    db.query(SharedApiLog).filter(SharedApiLog.api_id == api_id).delete()
+    db.delete(api)
+    db.commit()
+    return {"message": "删除成功"}
+
+
+# ========== API测试 ==========
+
+@router.post("/{api_id}/test")
+async def test_api(
+    api_id: int,
+    data: ApiTestRequest,
+    db: Session = Depends(get_db),
+    user: User = Depends(verify_hub_access),
+):
+    """在线测试API（后端代理请求）"""
+    api = db.query(SharedApi).filter(SharedApi.id == api_id).first()
+    if not api:
+        raise HTTPException(status_code=404, detail="API不存在")
+
+    url = api.base_url.rstrip("/")
+    if data.path:
+        url = url + "/" + data.path.lstrip("/")
+
+    headers = dict(data.headers) if data.headers else {}
+    # 注入认证信息
+    if api.auth_type != "none" and api.api_key_encrypted:
+        key = decrypt_key(api.api_key_encrypted)
+        if key:
+            if api.auth_type == "bearer":
+                headers[api.api_key_header] = f"Bearer {key}"
+            elif api.auth_type == "api_key":
+                headers[api.api_key_header] = key
+            elif api.auth_type == "basic":
+                import base64
+                headers["Authorization"] = f"Basic {base64.b64encode(key.encode()).decode()}"
+
+    import httpx
+    start = time.time()
+    try:
+        async with httpx.AsyncClient(timeout=15) as client:
+            if data.method.upper() == "POST":
+                resp = await client.post(url, headers=headers, content=data.body or None)
+            elif data.method.upper() == "PUT":
+                resp = await client.put(url, headers=headers, content=data.body or None)
+            elif data.method.upper() == "DELETE":
+                resp = await client.delete(url, headers=headers)
+            else:
+                resp = await client.get(url, headers=headers)
+        elapsed = int((time.time() - start) * 1000)
+        # 记录日志
+        log = SharedApiLog(
+            api_id=api_id, user_id=user.id, action="test",
+            request_url=url, response_status=resp.status_code, response_time_ms=elapsed,
+        )
+        db.add(log)
+        api.call_count = (api.call_count or 0) + 1
+        db.commit()
+        # 限制返回体大小
+        body = resp.text[:5000] if len(resp.text) > 5000 else resp.text
+        return {
+            "status_code": resp.status_code,
+            "response_time_ms": elapsed,
+            "headers": dict(resp.headers),
+            "body": body,
+        }
+    except Exception as e:
+        elapsed = int((time.time() - start) * 1000)
+        log = SharedApiLog(
+            api_id=api_id, user_id=user.id, action="test",
+            request_url=url, response_status=0, response_time_ms=elapsed,
+        )
+        db.add(log)
+        db.commit()
+        return {"status_code": 0, "response_time_ms": elapsed, "headers": {}, "body": str(e)}
+
+
+@router.post("/{api_id}/health-check")
+async def health_check(
+    api_id: int,
+    db: Session = Depends(get_db),
+    user: User = Depends(verify_hub_access),
+):
+    """健康检查"""
+    api = db.query(SharedApi).filter(SharedApi.id == api_id).first()
+    if not api:
+        raise HTTPException(status_code=404, detail="API不存在")
+
+    check_url = api.health_check_url or api.base_url
+    import httpx
+    start = time.time()
+    try:
+        async with httpx.AsyncClient(timeout=10) as client:
+            resp = await client.get(check_url)
+        elapsed = int((time.time() - start) * 1000)
+        status = "ok" if resp.status_code < 400 else "error"
+    except Exception:
+        elapsed = int((time.time() - start) * 1000)
+        status = "error"
+
+    api.last_check_time = datetime.utcnow()
+    api.last_check_status = status
+    log = SharedApiLog(
+        api_id=api_id, user_id=user.id, action="health_check",
+        request_url=check_url, response_status=resp.status_code if status == "ok" else 0,
+        response_time_ms=elapsed,
+    )
+    db.add(log)
+    db.commit()
+    return {"status": status, "response_time_ms": elapsed}
+
+
+# ========== 日志与统计 ==========
+
+@router.get("/{api_id}/logs")
+def get_api_logs(
+    api_id: int,
+    limit: int = 20,
+    db: Session = Depends(get_db),
+    user: User = Depends(verify_hub_access),
+):
+    logs = (
+        db.query(SharedApiLog)
+        .filter(SharedApiLog.api_id == api_id)
+        .order_by(SharedApiLog.id.desc())
+        .limit(limit)
+        .all()
+    )
+    return [
+        {
+            "id": l.id, "action": l.action, "request_url": l.request_url,
+            "response_status": l.response_status, "response_time_ms": l.response_time_ms,
+            "user_id": l.user_id,
+            "created_at": l.created_at.isoformat() if l.created_at else None,
+        }
+        for l in logs
+    ]
+
+@router.get("/stats")
+def get_stats(
+    db: Session = Depends(get_db),
+    user: User = Depends(verify_hub_access),
+):
+    total_apis = db.query(sa_func.count(SharedApi.id)).filter(SharedApi.is_active == True).scalar() or 0
+    total_calls = db.query(sa_func.sum(SharedApi.call_count)).scalar() or 0
+    total_categories = db.query(sa_func.count(SharedApiCategory.id)).scalar() or 0
+    healthy = db.query(sa_func.count(SharedApi.id)).filter(SharedApi.last_check_status == "ok").scalar() or 0
+    return {
+        "total_apis": total_apis,
+        "total_calls": total_calls,
+        "total_categories": total_categories,
+        "healthy_count": healthy,
+    }

backend/routers/upload.py

@@ -0,0 +1,206 @@
+"""通用文件上传路由 - 腾讯云COS"""
+import uuid
+import os
+from datetime import datetime
+from fastapi import APIRouter, UploadFile, File, Depends, HTTPException
+from sqlalchemy.orm import Session
+from routers.auth import get_current_user
+from models.user import User
+from models.system_config import SystemConfig
+from database import get_db
+from config import MAX_UPLOAD_SIZE, MAX_ATTACHMENT_SIZE, UPLOAD_DIR
+from models.attachment import Attachment
+
+router = APIRouter()
+
+ALLOWED_IMAGE_TYPES = ["image/jpeg", "image/png", "image/gif", "image/webp"]
+
+ALLOWED_ATTACHMENT_TYPES = [
+    "application/pdf",
+    "application/msword",
+    "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
+    "application/vnd.ms-excel",
+    "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
+    "application/vnd.ms-powerpoint",
+    "application/vnd.openxmlformats-officedocument.presentationml.presentation",
+    "application/zip",
+    "application/x-zip-compressed",
+    "application/x-rar-compressed",
+    "application/vnd.rar",
+]
+ALLOWED_ATTACHMENT_EXTS = {
+    "pdf", "doc", "docx", "xls", "xlsx", "ppt", "pptx", "zip", "rar",
+}
+
+
+def _get_cos_config(db: Session) -> dict:
+    """从数据库读取COS配置"""
+    keys = ["cos_secret_id", "cos_secret_key", "cos_bucket", "cos_region", "cos_custom_domain"]
+    config = {}
+    for k in keys:
+        row = db.query(SystemConfig).filter(SystemConfig.key == k).first()
+        config[k] = row.value if row else ""
+    return config
+
+
+def _get_cos_client(db: Session):
+    """获取COS客户端实例，未配置则返回None"""
+    config = _get_cos_config(db)
+    secret_id = config.get("cos_secret_id", "")
+    secret_key = config.get("cos_secret_key", "")
+    bucket = config.get("cos_bucket", "")
+    region = config.get("cos_region", "")
+    if not all([secret_id, secret_key, bucket, region]):
+        return None, config
+    try:
+        from qcloud_cos import CosConfig, CosS3Client
+        cos_config = CosConfig(Region=region, SecretId=secret_id, SecretKey=secret_key)
+        client = CosS3Client(cos_config)
+        return client, config
+    except ImportError:
+        return None, config
+
+
+def _build_cos_url(config: dict, object_key: str) -> str:
+    """构建COS访问URL"""
+    custom_domain = config.get("cos_custom_domain", "")
+    if custom_domain:
+        return f"https://{custom_domain}/{object_key}"
+    bucket = config.get("cos_bucket", "")
+    region = config.get("cos_region", "")
+    return f"https://{bucket}.cos.{region}.myqcloud.com/{object_key}"
+
+
+@router.post("/image")
+async def upload_image(
+    file: UploadFile = File(...),
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """上传图片，优先OSS，未配置则本地存储"""
+    # 验证文件类型
+    if file.content_type not in ALLOWED_IMAGE_TYPES:
+        raise HTTPException(status_code=400, detail="不支持的文件类型，仅支持 JPG/PNG/GIF/WEBP")
+
+    # 读取文件内容
+    content = await file.read()
+
+    # 验证文件大小
+    if len(content) > MAX_UPLOAD_SIZE:
+        raise HTTPException(status_code=400, detail=f"文件过大，最大支持 {MAX_UPLOAD_SIZE // (1024*1024)}MB")
+
+    # 生成唯一文件名
+    ext = file.filename.split(".")[-1].lower() if "." in file.filename else "png"
+    date_prefix = datetime.now().strftime("%Y/%m")
+    filename = f"{uuid.uuid4().hex}.{ext}"
+    object_key = f"images/{date_prefix}/{filename}"
+
+    # 尝试COS上传（从数据库读取配置）
+    client, config = _get_cos_client(db)
+    if client:
+        try:
+            client.put_object(
+                Bucket=config.get("cos_bucket", ""),
+                Body=content,
+                Key=object_key,
+                ContentType=file.content_type,
+            )
+            url = _build_cos_url(config, object_key)
+            return {"url": url, "storage": "cos"}
+        except Exception as e:
+            raise HTTPException(status_code=500, detail=f"COS上传失败: {str(e)}")
+    else:
+        # 降级到本地存储
+        os.makedirs(UPLOAD_DIR, exist_ok=True)
+        filepath = os.path.join(UPLOAD_DIR, filename)
+        with open(filepath, "wb") as f:
+            f.write(content)
+        return {"url": f"/uploads/{filename}", "storage": "local"}
+
+
+@router.post("/attachment")
+async def upload_attachment(
+    file: UploadFile = File(...),
+    post_id: int = 0,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """上传附件到COS，支持 PDF/Word/Excel/PPT/ZIP/RAR"""
+    # 验证文件扩展名
+    ext = file.filename.split(".")[-1].lower() if "." in file.filename else ""
+    if ext not in ALLOWED_ATTACHMENT_EXTS:
+        raise HTTPException(
+            status_code=400,
+            detail=f"不支持的文件类型，仅支持: {', '.join(sorted(ALLOWED_ATTACHMENT_EXTS))}",
+        )
+
+    # 读取文件内容
+    content = await file.read()
+    if len(content) > MAX_ATTACHMENT_SIZE:
+        raise HTTPException(
+            status_code=400,
+            detail=f"文件过大，最大支持 {MAX_ATTACHMENT_SIZE // (1024*1024)}MB",
+        )
+
+    # 生成唯一文件名
+    date_prefix = datetime.now().strftime("%Y/%m")
+    unique_name = f"{uuid.uuid4().hex}.{ext}"
+    object_key = f"attachments/{date_prefix}/{unique_name}"
+
+    # 上传到COS
+    client, config = _get_cos_client(db)
+    if not client:
+        raise HTTPException(status_code=500, detail="对象存储未配置，无法上传附件")
+
+    try:
+        client.put_object(
+            Bucket=config.get("cos_bucket", ""),
+            Body=content,
+            Key=object_key,
+            ContentType=file.content_type or "application/octet-stream",
+        )
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=f"COS上传失败: {str(e)}")
+
+    url = _build_cos_url(config, object_key)
+
+    # 写入数据库
+    attachment = Attachment(
+        post_id=post_id if post_id else None,
+        user_id=current_user.id,
+        filename=file.filename,
+        storage_key=object_key,
+        url=url,
+        file_size=len(content),
+        file_type=file.content_type or "application/octet-stream",
+    )
+    db.add(attachment)
+    db.commit()
+    db.refresh(attachment)
+
+    return {
+        "id": attachment.id,
+        "filename": attachment.filename,
+        "url": attachment.url,
+        "file_size": attachment.file_size,
+        "file_type": attachment.file_type,
+    }
+
+
+@router.put("/attachment/{attachment_id}/post")
+async def update_attachment_post(
+    attachment_id: int,
+    post_id: int = 0,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """将附件关联到帖子（新建帖子后回填 post_id）"""
+    attachment = db.query(Attachment).filter(
+        Attachment.id == attachment_id,
+        Attachment.user_id == current_user.id,
+    ).first()
+    if not attachment:
+        raise HTTPException(status_code=404, detail="附件不存在")
+    attachment.post_id = post_id
+    db.commit()
+    return {"message": "ok"}

backend/routers/users.py

@@ -0,0 +1,214 @@
+"""用户主页和关注系统路由"""
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.orm import Session
+from sqlalchemy import func
+from database import get_db
+from models.user import User
+from models.post import Post
+from models.follow import Follow
+from models.like import Collect
+from models.notification import Notification
+from routers.auth import get_current_user
+
+router = APIRouter()
+
+
+@router.get("/{user_id}")
+def get_user_profile(
+    user_id: int,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """获取用户主页信息"""
+    user = db.query(User).filter(User.id == user_id).first()
+    if not user:
+        raise HTTPException(status_code=404, detail="用户不存在")
+
+    post_count = db.query(func.count(Post.id)).filter(Post.user_id == user_id, Post.is_public == True).scalar()
+    follower_count = db.query(func.count(Follow.id)).filter(Follow.following_id == user_id).scalar()
+    following_count = db.query(func.count(Follow.id)).filter(Follow.follower_id == user_id).scalar()
+    is_following = db.query(Follow).filter(
+        Follow.follower_id == current_user.id, Follow.following_id == user_id
+    ).first() is not None
+
+    return {
+        "id": user.id,
+        "username": user.username,
+        "email": user.email,
+        "avatar": user.avatar,
+        "created_at": user.created_at,
+        "post_count": post_count,
+        "follower_count": follower_count,
+        "following_count": following_count,
+        "is_following": is_following,
+        "is_self": current_user.id == user_id,
+    }
+
+
+@router.post("/{user_id}/follow")
+def toggle_follow(
+    user_id: int,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """关注/取消关注"""
+    if current_user.id == user_id:
+        raise HTTPException(status_code=400, detail="不能关注自己")
+
+    target = db.query(User).filter(User.id == user_id).first()
+    if not target:
+        raise HTTPException(status_code=404, detail="用户不存在")
+
+    existing = db.query(Follow).filter(
+        Follow.follower_id == current_user.id, Follow.following_id == user_id
+    ).first()
+
+    if existing:
+        db.delete(existing)
+        db.commit()
+        return {"followed": False}
+    else:
+        follow = Follow(follower_id=current_user.id, following_id=user_id)
+        db.add(follow)
+        # 创建通知
+        notif = Notification(
+            user_id=user_id,
+            type="follow",
+            content=f"{current_user.username} 关注了你",
+            from_user_id=current_user.id,
+            related_id=current_user.id,
+        )
+        db.add(notif)
+        db.commit()
+        return {"followed": True}
+
+
+@router.get("/{user_id}/posts")
+def get_user_posts(
+    user_id: int,
+    page: int = 1,
+    page_size: int = 20,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """获取用户的帖子列表"""
+    query = db.query(Post).filter(Post.user_id == user_id)
+    if user_id != current_user.id:
+        query = query.filter(Post.is_public == True)
+    posts = query.order_by(Post.created_at.desc()).offset((page - 1) * page_size).limit(page_size).all()
+
+    user = db.query(User).filter(User.id == user_id).first()
+    username = user.username if user else "未知"
+    avatar = user.avatar if user else ""
+
+    return [
+        {
+            "id": p.id, "title": p.title, "content": p.content[:200],
+            "category": p.category, "tags": p.tags,
+            "view_count": p.view_count, "like_count": p.like_count,
+            "comment_count": p.comment_count, "collect_count": p.collect_count,
+            "created_at": p.created_at, "updated_at": p.updated_at,
+            "author": {"id": user_id, "username": username, "avatar": avatar},
+        }
+        for p in posts
+    ]
+
+
+@router.get("/{user_id}/followers")
+def get_followers(
+    user_id: int,
+    page: int = 1,
+    page_size: int = 20,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """获取粉丝列表"""
+    follows = (
+        db.query(Follow)
+        .filter(Follow.following_id == user_id)
+        .order_by(Follow.created_at.desc())
+        .offset((page - 1) * page_size).limit(page_size).all()
+    )
+    user_ids = [f.follower_id for f in follows]
+    users = db.query(User).filter(User.id.in_(user_ids)).all() if user_ids else []
+    user_map = {u.id: u for u in users}
+
+    return [
+        {
+            "id": uid,
+            "username": user_map[uid].username if uid in user_map else "",
+            "avatar": user_map[uid].avatar if uid in user_map else "",
+        }
+        for uid in user_ids
+    ]
+
+
+@router.get("/{user_id}/following")
+def get_following(
+    user_id: int,
+    page: int = 1,
+    page_size: int = 20,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """获取关注列表"""
+    follows = (
+        db.query(Follow)
+        .filter(Follow.follower_id == user_id)
+        .order_by(Follow.created_at.desc())
+        .offset((page - 1) * page_size).limit(page_size).all()
+    )
+    user_ids = [f.following_id for f in follows]
+    users = db.query(User).filter(User.id.in_(user_ids)).all() if user_ids else []
+    user_map = {u.id: u for u in users}
+
+    return [
+        {
+            "id": uid,
+            "username": user_map[uid].username if uid in user_map else "",
+            "avatar": user_map[uid].avatar if uid in user_map else "",
+        }
+        for uid in user_ids
+    ]
+
+
+@router.get("/{user_id}/collects")
+def get_user_collects(
+    user_id: int,
+    page: int = 1,
+    page_size: int = 20,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """获取用户收藏的帖子"""
+    collects = (
+        db.query(Collect)
+        .filter(Collect.user_id == user_id)
+        .order_by(Collect.created_at.desc())
+        .offset((page - 1) * page_size).limit(page_size).all()
+    )
+    post_ids = [c.post_id for c in collects]
+    if not post_ids:
+        return []
+
+    posts = db.query(Post).filter(Post.id.in_(post_ids)).all()
+    post_map = {p.id: p for p in posts}
+    author_ids = list(set(p.user_id for p in posts))
+    authors = db.query(User).filter(User.id.in_(author_ids)).all()
+    author_map = {a.id: a for a in authors}
+
+    result = []
+    for pid in post_ids:
+        p = post_map.get(pid)
+        if not p:
+            continue
+        a = author_map.get(p.user_id)
+        result.append({
+            "id": p.id, "title": p.title, "content": p.content[:200],
+            "category": p.category, "tags": p.tags,
+            "view_count": p.view_count, "like_count": p.like_count,
+            "comment_count": p.comment_count, "collect_count": p.collect_count,
+            "created_at": p.created_at,
+            "author": {"id": p.user_id, "username": a.username if a else "", "avatar": a.avatar if a else ""},
+        })
+    return result

backend/routers/web_search.py

@@ -0,0 +1,274 @@
+"""联网搜索路由 - 使用豆包大模型 + 火山方舟 web_search"""
+import json
+import httpx
+from typing import List, Optional
+from fastapi import APIRouter, Depends, HTTPException
+from fastapi.responses import StreamingResponse
+from sqlalchemy.orm import Session
+from pydantic import BaseModel
+
+from database import get_db
+from models.user import User
+from models.conversation import Conversation, Message
+from schemas.conversation import ConversationResponse, ConversationDetail, MessageResponse
+from routers.auth import get_current_user
+from config import ARK_API_KEY, ARK_ENDPOINT, ARK_BASE_URL
+
+router = APIRouter()
+
+WEB_SEARCH_SYSTEM_PROMPT = """你是一个智能联网搜索助手。你可以通过联网搜索获取最新信息来回答用户的问题。
+
+回答要求：
+1. 基于搜索到的最新信息给出准确、详细的回答
+2. 使用清晰的 Markdown 格式组织内容
+3. 如果涉及时效性信息，注明信息的时间
+4. 对搜索结果进行整合和总结，而非简单罗列
+5. 如果搜索结果不足以回答问题，诚实告知并给出建议"""
+
+
+class WebSearchRequest(BaseModel):
+    conversation_id: Optional[int] = None
+    content: str
+    model_config_id: Optional[int] = None
+
+
+@router.post("/search")
+async def web_search(
+    request: WebSearchRequest,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """联网搜索 - 流式输出"""
+    # 获取模型配置：优先用指定的，否则用 .env 的 ARK 配置
+    from services.ai_service import _get_db_model_config
+    ark_api_key = ARK_API_KEY
+    ark_endpoint = ARK_ENDPOINT
+    ark_base_url = ARK_BASE_URL
+    search_count = 5
+
+    if request.model_config_id:
+        cfg = _get_db_model_config("", request.model_config_id)
+        if cfg:
+            ark_api_key = cfg["api_key"]
+            ark_endpoint = cfg["model"]
+            ark_base_url = cfg["base_url"] or ARK_BASE_URL
+            search_count = cfg.get("web_search_count", 5)
+
+    if not ark_api_key:
+        raise HTTPException(status_code=500, detail="未配置火山方舟 API Key")
+
+    # 创建或获取对话
+    if request.conversation_id:
+        conv = db.query(Conversation).filter(
+            Conversation.id == request.conversation_id,
+            Conversation.user_id == current_user.id,
+        ).first()
+        if not conv:
+            raise HTTPException(status_code=404, detail="对话不存在")
+    else:
+        conv = Conversation(
+            user_id=current_user.id,
+            title=request.content[:50] if request.content else "新搜索",
+            type="web_search",
+        )
+        db.add(conv)
+        db.commit()
+        db.refresh(conv)
+
+    # 保存用户消息
+    user_msg = Message(
+        conversation_id=conv.id,
+        role="user",
+        content=request.content,
+    )
+    db.add(user_msg)
+    db.commit()
+
+    # 构建历史消息
+    history_msgs = (
+        db.query(Message)
+        .filter(Message.conversation_id == conv.id)
+        .order_by(Message.created_at.asc())
+        .all()
+    )
+
+    messages = [{"role": "system", "content": WEB_SEARCH_SYSTEM_PROMPT}]
+    for msg in history_msgs:
+        messages.append({"role": msg.role, "content": msg.content})
+
+    # 流式调用火山方舟 API
+    url = f"{ark_base_url}/chat/completions"
+    headers = {
+        "Authorization": f"Bearer {ark_api_key}",
+        "Content-Type": "application/json",
+    }
+
+
+    async def generate():
+        full_response = ""
+        try:
+            payload_with_search = {
+                "model": ark_endpoint,
+                "messages": messages,
+                "stream": True,
+                "tools": [
+                    {
+                        "type": "web_search",
+                        "web_search": {"enable": True, "search_result_count": max(1, min(50, search_count))},
+                    }
+                ],
+            }
+            payload_without_search = {
+                "model": ark_endpoint,
+                "messages": messages,
+                "stream": True,
+            }
+
+            # 先尝试带联网搜索调用
+            use_fallback = False
+            async with httpx.AsyncClient(timeout=120.0) as client:
+                async with client.stream("POST", url, json=payload_with_search, headers=headers) as resp:
+                    if resp.status_code == 400:
+                        # 模型不支持 web_search tools，降级到普通调用
+                        await resp.aread()
+                        use_fallback = True
+                    elif resp.status_code != 200:
+                        error_body = await resp.aread()
+                        error_msg = f"API 调用失败 ({resp.status_code}): {error_body.decode()}"
+                        yield f"data: {json.dumps({'content': error_msg, 'done': False})}\n\n"
+                        full_response = error_msg
+                    else:
+                        buffer = ""
+                        async for chunk in resp.aiter_text():
+                            buffer += chunk
+                            while "\n" in buffer:
+                                line, buffer = buffer.split("\n", 1)
+                                line = line.strip()
+                                if not line or not line.startswith("data: "):
+                                    continue
+                                data_str = line[6:]
+                                if data_str == "[DONE]":
+                                    continue
+                                try:
+                                    data = json.loads(data_str)
+                                    choices = data.get("choices", [])
+                                    if choices:
+                                        delta = choices[0].get("delta", {})
+                                        content = delta.get("content", "")
+                                        if content:
+                                            full_response += content
+                                            yield f"data: {json.dumps({'content': content, 'done': False})}\n\n"
+                                except json.JSONDecodeError:
+                                    pass
+
+            # 降级：不带 web_search tools 重试
+            if use_fallback:
+                async with httpx.AsyncClient(timeout=120.0) as client:
+                    async with client.stream("POST", url, json=payload_without_search, headers=headers) as resp:
+                        if resp.status_code != 200:
+                            error_body = await resp.aread()
+                            error_msg = f"API 调用失败 ({resp.status_code}): {error_body.decode()}"
+                            yield f"data: {json.dumps({'content': error_msg, 'done': False})}\n\n"
+                            full_response = error_msg
+                        else:
+                            buffer = ""
+                            async for chunk in resp.aiter_text():
+                                buffer += chunk
+                                while "\n" in buffer:
+                                    line, buffer = buffer.split("\n", 1)
+                                    line = line.strip()
+                                    if not line or not line.startswith("data: "):
+                                        continue
+                                    data_str = line[6:]
+                                    if data_str == "[DONE]":
+                                        continue
+                                    try:
+                                        data = json.loads(data_str)
+                                        choices = data.get("choices", [])
+                                        if choices:
+                                            delta = choices[0].get("delta", {})
+                                            content = delta.get("content", "")
+                                            if content:
+                                                full_response += content
+                                                yield f"data: {json.dumps({'content': content, 'done': False})}\n\n"
+                                    except json.JSONDecodeError:
+                                        pass
+        except Exception as e:
+            error_msg = f"联网搜索出错: {str(e)}"
+            if not full_response:
+                full_response = error_msg
+            yield f"data: {json.dumps({'content': error_msg, 'done': False})}\n\n"
+
+        # 保存AI回复
+        if full_response:
+            ai_msg = Message(
+                conversation_id=conv.id,
+                role="assistant",
+                content=full_response,
+            )
+            db.add(ai_msg)
+            db.commit()
+
+        yield f"data: {json.dumps({'content': '', 'done': True, 'conversation_id': conv.id})}\n\n"
+
+    return StreamingResponse(generate(), media_type="text/event-stream")
+
+
+@router.get("/conversations", response_model=List[ConversationResponse])
+def get_conversations(
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """获取联网搜索对话列表"""
+    conversations = (
+        db.query(Conversation)
+        .filter(Conversation.user_id == current_user.id, Conversation.type == "web_search")
+        .order_by(Conversation.updated_at.desc())
+        .all()
+    )
+    return [ConversationResponse.model_validate(c) for c in conversations]
+
+
+@router.get("/conversations/{conversation_id}", response_model=ConversationDetail)
+def get_conversation_detail(
+    conversation_id: int,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """获取对话详情"""
+    conv = db.query(Conversation).filter(
+        Conversation.id == conversation_id,
+        Conversation.user_id == current_user.id,
+    ).first()
+    if not conv:
+        raise HTTPException(status_code=404, detail="对话不存在")
+
+    msgs = (
+        db.query(Message)
+        .filter(Message.conversation_id == conversation_id)
+        .order_by(Message.created_at.asc())
+        .all()
+    )
+    result = ConversationDetail.model_validate(conv)
+    result.messages = [MessageResponse.model_validate(m) for m in msgs]
+    return result
+
+
+@router.delete("/conversations/{conversation_id}")
+def delete_conversation(
+    conversation_id: int,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """删除对话"""
+    conv = db.query(Conversation).filter(
+        Conversation.id == conversation_id,
+        Conversation.user_id == current_user.id,
+    ).first()
+    if not conv:
+        raise HTTPException(status_code=404, detail="对话不存在")
+
+    db.query(Message).filter(Message.conversation_id == conversation_id).delete()
+    db.delete(conv)
+    db.commit()
+    return {"message": "删除成功"}

backend/schemas/ai_model.py

@@ -0,0 +1,62 @@
+"""AI模型配置Schema"""
+from pydantic import BaseModel
+from datetime import datetime
+from typing import Optional, List
+
+
+class AIModelCreate(BaseModel):
+    provider: str
+    provider_name: str = ""
+    model_id: str
+    model_name: str = ""
+    api_key: str = ""
+    base_url: str = ""
+    task_type: str = ""
+    is_enabled: bool = True
+    is_default: bool = False
+    web_search_enabled: bool = False
+    web_search_count: int = 5  # 联网搜索结果条数，1-50
+    description: str = ""
+
+
+class AIModelUpdate(BaseModel):
+    provider_name: Optional[str] = None
+    model_id: Optional[str] = None
+    model_name: Optional[str] = None
+    api_key: Optional[str] = None
+    base_url: Optional[str] = None
+    task_type: Optional[str] = None
+    is_enabled: Optional[bool] = None
+    is_default: Optional[bool] = None
+    web_search_enabled: Optional[bool] = None
+    web_search_count: Optional[int] = None
+    description: Optional[str] = None
+
+
+class AIModelResponse(BaseModel):
+    id: int
+    provider: str
+    provider_name: str = ""
+    model_id: str
+    model_name: str = ""
+    api_key_masked: str = ""  # 脱敏后的API Key
+    base_url: str = ""
+    task_type: str = ""
+    is_enabled: bool = True
+    is_default: bool = False
+    web_search_enabled: bool = False
+    web_search_count: int = 5
+    description: str = ""
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+class ProviderInfo(BaseModel):
+    """服务商信息"""
+    provider: str
+    name: str
+    models: List[dict]
+    default_base_url: str = ""

backend/schemas/bookmark.py

@@ -0,0 +1,38 @@
+"""网站收藏Schema"""
+from pydantic import BaseModel
+from datetime import datetime
+from typing import Optional, List
+
+
+class BookmarkCreate(BaseModel):
+    name: str
+    url: str
+    icon: str = ""
+
+
+class BookmarkUpdate(BaseModel):
+    name: Optional[str] = None
+    url: Optional[str] = None
+    icon: Optional[str] = None
+    sort_order: Optional[int] = None
+
+
+class BookmarkResponse(BaseModel):
+    id: int
+    name: str
+    url: str
+    icon: str = ""
+    sort_order: int = 0
+    created_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+class ReorderItem(BaseModel):
+    id: int
+    sort_order: int
+
+
+class ReorderRequest(BaseModel):
+    items: List[ReorderItem]

backend/schemas/conversation.py

@@ -0,0 +1,55 @@
+"""对话相关Schema"""
+from pydantic import BaseModel
+from datetime import datetime
+from typing import Optional, List
+
+
+class MessageCreate(BaseModel):
+    content: str
+    image_urls: List[str] = []
+
+
+class MessageResponse(BaseModel):
+    id: int
+    conversation_id: int
+    role: str
+    content: str
+    image_urls: str = ""
+    created_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+class ConversationCreate(BaseModel):
+    type: str  # requirement / architecture
+    title: str = "新对话"
+
+
+class ConversationResponse(BaseModel):
+    id: int
+    user_id: int
+    title: str
+    type: str
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+class ConversationDetail(ConversationResponse):
+    messages: List[MessageResponse] = []
+
+
+class RequirementAnalyzeRequest(BaseModel):
+    conversation_id: Optional[int] = None
+    content: str
+    image_urls: List[str] = []
+    model_config_id: Optional[int] = None
+
+
+class ArchitectureRequest(BaseModel):
+    conversation_id: Optional[int] = None
+    content: str
+    model_config_id: Optional[int] = None

backend/schemas/post.py

@@ -0,0 +1,69 @@
+"""帖子相关Schema"""
+from pydantic import BaseModel
+from datetime import datetime
+from typing import Optional, List
+
+
+class PostCreate(BaseModel):
+    title: str
+    content: str
+    category: str = ""
+    tags: List[str] = []
+    is_public: bool = True
+    is_draft: bool = False
+
+
+class PostUpdate(BaseModel):
+    title: Optional[str] = None
+    content: Optional[str] = None
+    category: Optional[str] = None
+    tags: Optional[List[str]] = None
+    is_public: Optional[bool] = None
+    is_draft: Optional[bool] = None
+
+
+class PostResponse(BaseModel):
+    id: int
+    user_id: int
+    title: str
+    content: str
+    category: str = ""
+    tags: str = ""
+    is_public: bool = True
+    is_draft: bool = False
+    view_count: int = 0
+    like_count: int = 0
+    collect_count: int = 0
+    comment_count: int = 0
+    created_at: datetime
+    updated_at: datetime
+    # 额外字段（查询时填充）
+    author_name: str = ""
+    is_liked: bool = False
+    is_collected: bool = False
+
+    class Config:
+        from_attributes = True
+
+
+class PostListResponse(BaseModel):
+    items: List[PostResponse]
+    total: int
+    page: int
+    page_size: int
+
+
+class CommentCreate(BaseModel):
+    content: str
+
+
+class CommentResponse(BaseModel):
+    id: int
+    post_id: int
+    user_id: int
+    content: str
+    created_at: datetime
+    author_name: str = ""
+
+    class Config:
+        from_attributes = True

backend/schemas/user.py

@@ -0,0 +1,43 @@
+"""用户相关Schema"""
+from pydantic import BaseModel, EmailStr
+from datetime import datetime
+from typing import Optional
+
+
+class UserRegister(BaseModel):
+    username: str
+    email: str
+    password: str
+
+
+class UserLogin(BaseModel):
+    username: str
+    password: str
+
+
+class UserResponse(BaseModel):
+    id: int
+    username: str
+    email: str
+    avatar: str = ""
+    is_admin: bool = False
+    is_banned: bool = False
+    is_approved: bool = False
+    created_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+class UserUpdate(BaseModel):
+    username: Optional[str] = None
+    email: Optional[str] = None
+    avatar: Optional[str] = None
+    old_password: Optional[str] = None
+    new_password: Optional[str] = None
+
+
+class TokenResponse(BaseModel):
+    access_token: str
+    token_type: str = "bearer"
+    user: UserResponse

backend/services/ai_service.py

@@ -0,0 +1,429 @@
+"""统一大模型调用服务 - 支持多模型路由和流式输出"""
+import json
+import httpx
+import asyncio
+from typing import AsyncGenerator, List, Optional, Union
+from openai import AsyncOpenAI
+from anthropic import AsyncAnthropic
+
+from config import (
+    MODEL_CONFIG,
+    OPENAI_API_KEY,
+    ANTHROPIC_API_KEY,
+    GOOGLE_API_KEY,
+    DEEPSEEK_API_KEY,
+    ARK_API_KEY,
+    ARK_BASE_URL,
+)
+
+
+def _get_db_model_config(task_type: str, model_config_id: int = None):
+    """从数据库获取指定任务类型的默认模型配置，或指定 ID 的模型"""
+    try:
+        from database import SessionLocal
+        from models.ai_model import AIModelConfig
+        db = SessionLocal()
+        try:
+            # 如果指定了模型 ID，直接用该模型
+            if model_config_id:
+                model = db.query(AIModelConfig).filter(
+                    AIModelConfig.id == model_config_id,
+                    AIModelConfig.is_enabled == True,
+                ).first()
+                if model and model.api_key:
+                    return {
+                        "provider": model.provider,
+                        "model": model.model_id,
+                        "api_key": model.api_key,
+                        "base_url": model.base_url,
+                        "web_search_enabled": model.web_search_enabled,
+                        "web_search_count": model.web_search_count or 5,
+                    }
+            # 否则找默认模型
+            model = db.query(AIModelConfig).filter(
+                AIModelConfig.task_type == task_type,
+                AIModelConfig.is_default == True,
+                AIModelConfig.is_enabled == True,
+            ).first()
+            if model and model.api_key:
+                return {
+                    "provider": model.provider,
+                    "model": model.model_id,
+                    "api_key": model.api_key,
+                    "base_url": model.base_url,
+                    "web_search_enabled": model.web_search_enabled,
+                    "web_search_count": model.web_search_count or 5,
+                }
+            # 没有默认的，找任意一个启用且有Key的
+            model = db.query(AIModelConfig).filter(
+                AIModelConfig.task_type == task_type,
+                AIModelConfig.is_enabled == True,
+                AIModelConfig.api_key != "",
+            ).first()
+            if model:
+                return {
+                    "provider": model.provider,
+                    "model": model.model_id,
+                    "api_key": model.api_key,
+                    "base_url": model.base_url,
+                    "web_search_enabled": model.web_search_enabled,
+                    "web_search_count": model.web_search_count or 5,
+                }
+        finally:
+            db.close()
+    except Exception:
+        pass
+    return None
+
+
+class AIService:
+    """统一AI服务，根据任务类型路由到不同大模型"""
+
+    def __init__(self):
+        # OpenAI客户端（也用于DeepSeek等兼容API）
+        if OPENAI_API_KEY:
+            self.openai_client = AsyncOpenAI(api_key=OPENAI_API_KEY)
+        else:
+            self.openai_client = None
+
+        # Anthropic客户端
+        if ANTHROPIC_API_KEY:
+            self.anthropic_client = AsyncAnthropic(api_key=ANTHROPIC_API_KEY)
+        else:
+            self.anthropic_client = None
+
+        # DeepSeek客户端（兼容OpenAI接口）
+        if DEEPSEEK_API_KEY:
+            self.deepseek_client = AsyncOpenAI(
+                api_key=DEEPSEEK_API_KEY,
+                base_url="https://api.deepseek.com/v1",
+            )
+        else:
+            self.deepseek_client = None
+
+    def _get_client_for_provider(self, provider: str, api_key: str, base_url: str = ""):
+        """根据provider动态创建客户端"""
+        if provider == "anthropic":
+            return AsyncAnthropic(api_key=api_key)
+        # openai/deepseek/google 都用OpenAI兼容接口
+        kwargs = {"api_key": api_key}
+        if base_url:
+            kwargs["base_url"] = base_url
+        return AsyncOpenAI(**kwargs)
+
+    async def chat(
+        self,
+        task_type: str,
+        messages: List[dict],
+        system_prompt: str = "",
+        stream: bool = False,
+        model_config_id: int = None,
+    ) -> Union[str, AsyncGenerator[str, None]]:
+        """
+        统一对话接口
+
+        参数:
+            task_type: 任务类型 (multimodal/reasoning/lightweight)
+            messages: 消息列表 [{"role": "user", "content": "..."}]
+            system_prompt: 系统提示词
+            stream: 是否流式输出
+            model_config_id: 指定模型配置ID（可选，不传则用默认）
+        """
+        # 优先从数据库读取模型配置
+        db_config = _get_db_model_config(task_type, model_config_id)
+        if db_config:
+            provider = db_config["provider"]
+            model = db_config["model"]
+            api_key = db_config["api_key"]
+            base_url = db_config["base_url"]
+            web_search = db_config.get("web_search_enabled", False)
+            web_search_count = db_config.get("web_search_count", 5)
+            # 火山方舟/豆包 + 联网搜索（开启后自动使用，失败则降级到普通调用）
+            if provider == "ark" and web_search:
+                try:
+                    return await self._chat_ark_web_search(api_key, base_url, model, messages, system_prompt, stream, web_search_count)
+                except Exception:
+                    # 联网搜索调用失败，降级到普通调用
+                    pass
+            # 火山方舟/豆包 不带联网搜索（OpenAI 兼容接口）
+            if provider == "ark":
+                kwargs = {"api_key": api_key}
+                if base_url:
+                    kwargs["base_url"] = base_url
+                else:
+                    kwargs["base_url"] = ARK_BASE_URL
+                client = AsyncOpenAI(**kwargs)
+                return await self._chat_openai(client, model, messages, system_prompt, stream)
+            if provider == "anthropic":
+                client = AsyncAnthropic(api_key=api_key)
+                return await self._chat_anthropic_with_client(client, model, messages, system_prompt, stream)
+            else:
+                kwargs = {"api_key": api_key}
+                if base_url:
+                    kwargs["base_url"] = base_url
+                client = AsyncOpenAI(**kwargs)
+                # deepseek-reasoner 需要特殊处理
+                if model == "deepseek-reasoner":
+                    return await self._chat_deepseek_reasoner(client, model, messages, system_prompt, stream)
+                return await self._chat_openai(client, model, messages, system_prompt, stream)
+
+        # 回退到 .env 配置
+        config = MODEL_CONFIG.get(task_type, MODEL_CONFIG["reasoning"])
+        provider = config["provider"]
+        model = config["model"]
+
+        if provider == "anthropic" and self.anthropic_client:
+            return await self._chat_anthropic(model, messages, system_prompt, stream)
+        elif provider == "openai" and self.openai_client:
+            return await self._chat_openai(self.openai_client, model, messages, system_prompt, stream)
+        elif provider == "deepseek" and self.deepseek_client:
+            return await self._chat_openai(self.deepseek_client, model, messages, system_prompt, stream)
+        elif provider == "google":
+            if GOOGLE_API_KEY:
+                google_client = AsyncOpenAI(
+                    api_key=GOOGLE_API_KEY,
+                    base_url="https://generativelanguage.googleapis.com/v1beta/openai/",
+                )
+                return await self._chat_openai(google_client, model, messages, system_prompt, stream)
+        
+        # 降级
+        if self.deepseek_client:
+            return await self._chat_openai(self.deepseek_client, "deepseek-chat", messages, system_prompt, stream)
+        if self.openai_client:
+            return await self._chat_openai(self.openai_client, "gpt-4o-mini", messages, system_prompt, stream)
+        if self.anthropic_client:
+            return await self._chat_anthropic("claude-sonnet-4-20250514", messages, system_prompt, stream)
+        
+        return "未配置任何AI模型，请到「模型管理」页面配置模型和API Key。"
+
+    async def _chat_ark_web_search(
+        self, api_key: str, base_url: str, model: str,
+        messages: List[dict], system_prompt: str, stream: bool,
+        search_count: int = 5,
+    ) -> Union[str, AsyncGenerator[str, None]]:
+        """火山方舟 + 联网搜索（使用 httpx 直接调用，因 web_search 是非标准 tools 类型）"""
+        url = f"{base_url or ARK_BASE_URL}/chat/completions"
+        full_messages = []
+        if system_prompt:
+            full_messages.append({"role": "system", "content": system_prompt})
+        full_messages.extend(messages)
+
+        # 限制搜索条数范围 1-50
+        search_count = max(1, min(50, search_count or 5))
+        payload = {
+            "model": model,
+            "messages": full_messages,
+            "stream": stream,
+            "tools": [{"type": "web_search", "web_search": {"enable": True, "search_result_count": search_count}}],
+        }
+        headers = {
+            "Authorization": f"Bearer {api_key}",
+            "Content-Type": "application/json",
+        }
+
+        if not stream:
+            async with httpx.AsyncClient(timeout=120.0) as client:
+                resp = await client.post(url, json=payload, headers=headers)
+                if resp.status_code != 200:
+                    # 联网搜索调用失败，抛出异常以便降级到普通调用
+                    raise Exception(f"API调用失败 ({resp.status_code}): {resp.text[:200]}")
+                data = resp.json()
+                return data.get("choices", [{}])[0].get("message", {}).get("content", "")
+        else:
+            # 流式调用时，先发一个预检测请求确认模型支持 web_search
+            async with httpx.AsyncClient(timeout=10.0) as client:
+                test_payload = {
+                    "model": model,
+                    "messages": [{"role": "user", "content": "test"}],
+                    "stream": False,
+                    "max_tokens": 1,
+                    "tools": [{"type": "web_search", "web_search": {"enable": True, "search_result_count": 1}}],
+                }
+                try:
+                    resp = await client.post(url, json=test_payload, headers=headers)
+                    if resp.status_code == 400:
+                        # 模型不支持 web_search，抛出异常以便降级
+                        raise Exception("模型不支持联网搜索")
+                except httpx.TimeoutException:
+                    pass  # 超时不影响，继续尝试流式调用
+            return self._stream_ark_web_search(url, payload, headers)
+
+    async def _stream_ark_web_search(
+        self, url: str, payload: dict, headers: dict,
+    ) -> AsyncGenerator[str, None]:
+        """火山方舟联网搜索流式输出"""
+        async with httpx.AsyncClient(timeout=120.0) as client:
+            async with client.stream("POST", url, json=payload, headers=headers) as resp:
+                if resp.status_code != 200:
+                    error_body = await resp.aread()
+                    yield f"API调用失败 ({resp.status_code}): {error_body.decode()[:200]}"
+                    return
+                buffer = ""
+                async for chunk in resp.aiter_text():
+                    buffer += chunk
+                    while "\n" in buffer:
+                        line, buffer = buffer.split("\n", 1)
+                        line = line.strip()
+                        if not line or not line.startswith("data: "):
+                            continue
+                        data_str = line[6:]
+                        if data_str == "[DONE]":
+                            continue
+                        try:
+                            data = json.loads(data_str)
+                            choices = data.get("choices", [])
+                            if choices:
+                                delta = choices[0].get("delta", {})
+                                content = delta.get("content", "")
+                                if content:
+                                    yield content
+                        except json.JSONDecodeError:
+                            pass
+
+    async def _chat_openai(
+        self, client: AsyncOpenAI, model: str, messages: List[dict],
+        system_prompt: str, stream: bool,
+    ) -> Union[str, AsyncGenerator[str, None]]:
+        """OpenAI兼容接口调用"""
+        full_messages = []
+        if system_prompt:
+            full_messages.append({"role": "system", "content": system_prompt})
+        full_messages.extend(messages)
+
+        if stream:
+            return self._stream_openai(client, model, full_messages)
+        else:
+            response = await client.chat.completions.create(
+                model=model,
+                messages=full_messages,
+                temperature=0.7,
+                max_tokens=4096,
+            )
+            return response.choices[0].message.content
+
+    async def _stream_openai(
+        self, client: AsyncOpenAI, model: str, messages: List[dict],
+    ) -> AsyncGenerator[str, None]:
+        """OpenAI流式输出"""
+        response = await client.chat.completions.create(
+            model=model,
+            messages=messages,
+            temperature=0.7,
+            max_tokens=4096,
+            stream=True,
+        )
+        async for chunk in response:
+            if chunk.choices[0].delta.content:
+                yield chunk.choices[0].delta.content
+
+    async def _chat_deepseek_reasoner(
+        self, client: AsyncOpenAI, model: str, messages: List[dict],
+        system_prompt: str, stream: bool,
+    ) -> Union[str, AsyncGenerator[str, None]]:
+        """DeepSeek Reasoner (思考模式) 专用调用
+        
+        注意：deepseek-reasoner 不支持 temperature/top_p/system 等参数
+        输出包含 reasoning_content（思考过程）和 content（最终回答）
+        """
+        # reasoner 不支持 system role，将 system prompt 合并到第一条用户消息
+        full_messages = []
+        for msg in messages:
+            full_messages.append(msg)
+        if system_prompt and full_messages:
+            first_user = None
+            for m in full_messages:
+                if m["role"] == "user":
+                    first_user = m
+                    break
+            if first_user:
+                first_user["content"] = f"[指令] {system_prompt}\n\n[用户输入] {first_user['content']}"
+
+        if stream:
+            return self._stream_deepseek_reasoner(client, model, full_messages)
+        else:
+            response = await client.chat.completions.create(
+                model=model,
+                messages=full_messages,
+                max_tokens=8192,
+            )
+            reasoning = getattr(response.choices[0].message, 'reasoning_content', '') or ''
+            content = response.choices[0].message.content or ''
+            if reasoning:
+                return f"<think>\n{reasoning}\n</think>\n\n{content}"
+            return content
+
+    async def _stream_deepseek_reasoner(
+        self, client: AsyncOpenAI, model: str, messages: List[dict],
+    ) -> AsyncGenerator[str, None]:
+        """DeepSeek Reasoner 流式输出 - 包含思考过程和最终回答"""
+        response = await client.chat.completions.create(
+            model=model,
+            messages=messages,
+            max_tokens=8192,
+            stream=True,
+        )
+        in_reasoning = False
+        reasoning_started = False
+        async for chunk in response:
+            delta = chunk.choices[0].delta
+            # 思考过程
+            reasoning_content = getattr(delta, 'reasoning_content', None)
+            if reasoning_content:
+                if not reasoning_started:
+                    reasoning_started = True
+                    in_reasoning = True
+                    yield "<details>\n<summary>💭 思考过程</summary>\n\n"
+                yield reasoning_content
+            # 最终回答
+            if delta.content:
+                if in_reasoning:
+                    in_reasoning = False
+                    yield "\n</details>\n\n"
+                yield delta.content
+
+    async def _chat_anthropic(
+        self, model: str, messages: List[dict],
+        system_prompt: str, stream: bool,
+    ) -> Union[str, AsyncGenerator[str, None]]:
+        """Anthropic接口调用（使用self.anthropic_client）"""
+        return await self._chat_anthropic_with_client(self.anthropic_client, model, messages, system_prompt, stream)
+
+    async def _chat_anthropic_with_client(
+        self, client, model: str, messages: List[dict],
+        system_prompt: str, stream: bool,
+    ) -> Union[str, AsyncGenerator[str, None]]:
+        """Anthropic接口调用"""
+        if stream:
+            return self._stream_anthropic_with_client(client, model, messages, system_prompt)
+        else:
+            response = await client.messages.create(
+                model=model,
+                max_tokens=4096,
+                system=system_prompt if system_prompt else "You are a helpful assistant.",
+                messages=messages,
+            )
+            return response.content[0].text
+
+    async def _stream_anthropic(
+        self, model: str, messages: List[dict], system_prompt: str,
+    ) -> AsyncGenerator[str, None]:
+        """Anthropic流式输出（使用self.anthropic_client）"""
+        async for text in self._stream_anthropic_with_client(self.anthropic_client, model, messages, system_prompt):
+            yield text
+
+    async def _stream_anthropic_with_client(
+        self, client, model: str, messages: List[dict], system_prompt: str,
+    ) -> AsyncGenerator[str, None]:
+        """Anthropic流式输出"""
+        async with client.messages.stream(
+            model=model,
+            max_tokens=4096,
+            system=system_prompt if system_prompt else "You are a helpful assistant.",
+            messages=messages,
+        ) as stream:
+            async for text in stream.text_stream:
+                yield text
+
+
+# 单例
+ai_service = AIService()