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"