style(backend): apply ruff format

apps/backend/schemas/user.py

@@ -5,11 +5,13 @@ from pydantic import BaseModel, Field, EmailStr
 
 class UserBase(BaseModel):
     """用户基础 Schema"""
+
     alias: str = Field(..., min_length=2, max_length=50, description="用户别名（用于登录）")
 
 
 class UserCreate(UserBase):
     """创建用户 Schema（管理员手动创建，只需要别名）"""
+
     role: Optional[str] = Field("user", description="角色: user/admin")
     email: Optional[EmailStr] = Field(None, description="邮箱地址")
     password: Optional[str] = Field(None, min_length=6, description="初始密码（可选）")
@@ -18,24 +20,31 @@ class UserCreate(UserBase):
 
 class UserUpdate(BaseModel):
     """更新用户 Schema（管理员编辑用户）"""
+
     alias: Optional[str] = Field(None, min_length=2, max_length=50, description="用户别名")
     role: Optional[str] = None
     is_approved: Optional[bool] = None
     email: Optional[EmailStr] = None
-    password: Optional[str] = Field(None, min_length=6, description="新密码（可选，留空表示不修改）")
+    password: Optional[str] = Field(
+        None, min_length=6, description="新密码（可选，留空表示不修改）"
+    )
     reset_password: Optional[bool] = Field(False, description="是否清空密码")
 
 
 class UserUpdateProfile(BaseModel):
     """用户更新个人信息 Schema"""
+
     alias: Optional[str] = Field(None, min_length=2, max_length=50, description="新别名")
     email: Optional[EmailStr] = Field(None, description="邮箱地址")
-    current_password: Optional[str] = Field(None, min_length=6, description="当前密码（修改密码时必填）")
+    current_password: Optional[str] = Field(
+        None, min_length=6, description="当前密码（修改密码时必填）"
+    )
     new_password: Optional[str] = Field(None, min_length=6, description="新密码")
 
 
 class UserResponse(BaseModel):
     """用户响应 Schema"""
+
     id: int
     alias: str
     role: str
@@ -52,11 +61,13 @@ class UserResponse(BaseModel):
 
 class UserWithToken(UserResponse):
     """带 Token 的用户响应 Schema"""
+
     authorization: Optional[str] = None
 
 
 class TokenStatus(BaseModel):
     """Token 状态 Schema"""
+
     is_valid: bool
     jwt_exp: str
     expires_at: Optional[int] = None  # Unix 时间戳（秒）