docs(readme): 编写项目README文档，描述功能与架构

- 完整撰写玉宗珠宝设计大师项目README，介绍项目概况及核心功能
- 说明用户认证系统实现及优势，包含JWT鉴权和密码加密细节
- 详细描述品类管理系统，支持多流程类型和多种玉石品类
- 说明设计图生成方案及技术，包含Pillow生成示例及字体支持
- 介绍设计管理功能，支持分页浏览、预览、下载和删除设计
- 个人信息管理模块说明，涵盖昵称、手机号、密码的安全修改
- 绘制业务流程图和关键数据流图，清晰展现系统架构与数据流
- 提供详细API调用链路及参数说明，涵盖用户、品类、设计接口
- 列明技术栈及版本，包含前后端框架、ORM、认证、加密等工具
- 展示目录结构，标明后端与前端项目布局
- 规划本地开发环境与启动步骤，包括数据库初始化及运行命令
- 说明服务器部署流程和Nginx配置方案
- 详细数据库表结构说明及环境变量配置指导
- 汇总常用开发及测试命令，方便开发调试与部署管理

backend/app/schemas/__init__.py

@@ -0,0 +1,25 @@
+"""
+Pydantic Schemas
+导出所有 Schema 类型
+"""
+from .user import UserCreate, UserLogin, UserResponse, Token, UserUpdate, PasswordChange
+from .category import CategoryResponse, SubTypeResponse, ColorResponse
+from .design import DesignCreate, DesignResponse, DesignListResponse
+
+__all__ = [
+    # User schemas
+    "UserCreate",
+    "UserLogin",
+    "UserResponse",
+    "Token",
+    "UserUpdate",
+    "PasswordChange",
+    # Category schemas
+    "CategoryResponse",
+    "SubTypeResponse",
+    "ColorResponse",
+    # Design schemas
+    "DesignCreate",
+    "DesignResponse",
+    "DesignListResponse",
+]

backend/app/schemas/category.py

@@ -0,0 +1,42 @@
+"""
+品类相关 Pydantic Schemas
+"""
+from pydantic import BaseModel
+from typing import Optional
+
+
+class CategoryResponse(BaseModel):
+    """品类响应"""
+    id: int
+    name: str
+    icon: Optional[str] = None
+    sort_order: int
+    flow_type: str
+
+    class Config:
+        from_attributes = True
+
+
+class SubTypeResponse(BaseModel):
+    """子类型响应"""
+    id: int
+    category_id: int
+    name: str
+    description: Optional[str] = None
+    preview_image: Optional[str] = None
+    sort_order: int
+
+    class Config:
+        from_attributes = True
+
+
+class ColorResponse(BaseModel):
+    """颜色响应"""
+    id: int
+    category_id: int
+    name: str
+    hex_code: str
+    sort_order: int
+
+    class Config:
+        from_attributes = True

backend/app/schemas/design.py

@@ -0,0 +1,53 @@
+"""
+设计作品相关 Pydantic Schemas
+"""
+from pydantic import BaseModel, Field
+from datetime import datetime
+from typing import Optional, List
+
+from .category import CategoryResponse, SubTypeResponse, ColorResponse
+
+
+class DesignCreate(BaseModel):
+    """创建设计请求"""
+    category_id: int = Field(..., description="品类ID")
+    sub_type_id: Optional[int] = Field(None, description="子类型ID")
+    color_id: Optional[int] = Field(None, description="颜色ID")
+    prompt: str = Field(..., min_length=1, max_length=2000, description="设计需求")
+    carving_technique: Optional[str] = Field(None, max_length=50, description="雕刻工艺")
+    design_style: Optional[str] = Field(None, max_length=50, description="设计风格")
+    motif: Optional[str] = Field(None, max_length=100, description="题材纹样")
+    size_spec: Optional[str] = Field(None, max_length=100, description="尺寸规格")
+    surface_finish: Optional[str] = Field(None, max_length=50, description="表面处理")
+    usage_scene: Optional[str] = Field(None, max_length=50, description="用途场景")
+
+
+class DesignResponse(BaseModel):
+    """设计作品响应"""
+    id: int
+    user_id: int
+    category: CategoryResponse
+    sub_type: Optional[SubTypeResponse] = None
+    color: Optional[ColorResponse] = None
+    prompt: str
+    carving_technique: Optional[str] = None
+    design_style: Optional[str] = None
+    motif: Optional[str] = None
+    size_spec: Optional[str] = None
+    surface_finish: Optional[str] = None
+    usage_scene: Optional[str] = None
+    image_url: Optional[str] = None
+    status: str
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+class DesignListResponse(BaseModel):
+    """设计作品列表响应"""
+    items: List[DesignResponse]
+    total: int
+    page: int
+    page_size: int

backend/app/schemas/user.py

@@ -0,0 +1,51 @@
+"""
+用户相关 Pydantic Schemas
+"""
+from pydantic import BaseModel, Field
+from datetime import datetime
+from typing import Optional
+
+
+class UserCreate(BaseModel):
+    """用户注册请求"""
+    username: str = Field(..., min_length=2, max_length=50, description="用户名")
+    password: str = Field(..., min_length=6, max_length=100, description="密码")
+    nickname: Optional[str] = Field(None, max_length=50, description="昵称")
+
+
+class UserLogin(BaseModel):
+    """用户登录请求"""
+    username: str = Field(..., description="用户名")
+    password: str = Field(..., description="密码")
+
+
+class UserResponse(BaseModel):
+    """用户响应"""
+    id: int
+    username: str
+    nickname: Optional[str] = None
+    phone: Optional[str] = None
+    avatar: Optional[str] = None
+    created_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+class Token(BaseModel):
+    """认证令牌响应"""
+    access_token: str
+    token_type: str = "bearer"
+
+
+class UserUpdate(BaseModel):
+    """用户信息更新请求"""
+    nickname: Optional[str] = Field(None, max_length=50, description="昵称")
+    phone: Optional[str] = Field(None, max_length=20, description="手机号")
+    avatar: Optional[str] = Field(None, max_length=255, description="头像URL")
+
+
+class PasswordChange(BaseModel):
+    """修改密码请求"""
+    old_password: str = Field(..., description="旧密码")
+    new_password: str = Field(..., min_length=6, max_length=100, description="新密码")