初始版本

backend/app/schemas/user.py

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+"""
+用户相关的 Pydantic 模式
+"""
+from datetime import datetime
+from typing import Optional
+from pydantic import BaseModel, EmailStr
+
+
+class UserBase(BaseModel):
+    """用户基础模式"""
+    username: str
+    email: Optional[EmailStr] = None
+
+
+class UserCreate(UserBase):
+    """创建用户请求模式"""
+    password: str
+
+
+class UserUpdate(BaseModel):
+    """更新用户请求模式"""
+    username: Optional[str] = None
+    email: Optional[EmailStr] = None
+    password: Optional[str] = None
+
+
+class UserInDB(UserBase):
+    """数据库中的用户模式"""
+    id: int
+    created_at: datetime
+    
+    class Config:
+        from_attributes = True
+
+
+class User(UserInDB):
+    """用户响应模式（不包含敏感信息）"""
+    pass
+
+
+class Token(BaseModel):
+    """JWT 令牌响应模式"""
+    access_token: str
+    token_type: str = "bearer"
+
+
+class TokenData(BaseModel):
+    """令牌数据模式"""
+    username: Optional[str] = None
+