初步实现数据加密、权限管理、日志审计等功能

app/domain/schemas/user.py

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+from datetime import datetime
+from typing import Optional
+from pydantic import BaseModel, EmailStr, Field, ConfigDict
+from app.domain.models.role import UserRole
+
+# ============================================
+# Request Schemas (输入)
+# ============================================
+
+class UserCreate(BaseModel):
+    """用户注册"""
+    username: str = Field(..., min_length=3, max_length=50, 
+                         description="用户名，3-50个字符")
+    email: EmailStr = Field(..., description="邮箱地址")
+    password: str = Field(..., min_length=6, max_length=100, 
+                         description="密码，至少6个字符")
+    role: UserRole = Field(default=UserRole.USER, description="用户角色")
+
+class UserLogin(BaseModel):
+    """用户登录"""
+    username: str = Field(..., description="用户名或邮箱")
+    password: str = Field(..., description="密码")
+
+class UserUpdate(BaseModel):
+    """用户信息更新"""
+    email: Optional[EmailStr] = None
+    password: Optional[str] = Field(None, min_length=6, max_length=100)
+    role: Optional[UserRole] = None
+    is_active: Optional[bool] = None
+
+# ============================================
+# Response Schemas (输出)
+# ============================================
+
+class UserResponse(BaseModel):
+    """用户信息响应（不含密码）"""
+    id: int
+    username: str
+    email: str
+    role: UserRole
+    is_active: bool
+    is_superuser: bool
+    created_at: datetime
+    updated_at: datetime
+    
+    model_config = ConfigDict(from_attributes=True)
+
+class UserInDB(UserResponse):
+    """数据库中的用户（含密码哈希）"""
+    hashed_password: str
+
+# ============================================
+# Token Schemas
+# ============================================
+
+class Token(BaseModel):
+    """JWT Token 响应"""
+    access_token: str
+    refresh_token: Optional[str] = None
+    token_type: str = "bearer"
+    expires_in: int = Field(..., description="过期时间（秒）")
+
+class TokenPayload(BaseModel):
+    """JWT Token Payload"""
+    sub: str = Field(..., description="用户ID或用户名")
+    exp: Optional[int] = None
+    iat: Optional[int] = None
+    type: str = Field(default="access", description="token类型: access 或 refresh")