```

feat(auth): 添加用户权限获取接口并完善JWT令牌角色信息

- 在JWT令牌中添加用户角色信息
- 新增get_my_permissions接口用于获取当前用户权限码列表
- 重构认证回调逻辑，增加错误日志记录
- 更新用户信息获取接口使用Authorization头验证
```

backend/app/schemas/user.py

@@ -0,0 +1,30 @@
+"""用户相关 Schema"""
+from pydantic import BaseModel
+from typing import Optional
+from datetime import datetime
+
+
+class UserListItem(BaseModel):
+    id: int
+    username: str
+    email: Optional[str] = None
+    role: str
+    assigned_area: Optional[str] = None
+    assigned_school: Optional[str] = None
+    is_active: bool
+    last_login: Optional[datetime] = None
+    created_at: Optional[datetime] = None
+
+    class Config:
+        from_attributes = True
+
+
+class UserListResponse(BaseModel):
+    total: int
+    items: list[UserListItem]
+
+
+class UserRoleUpdate(BaseModel):
+    role: str  # admin / area_admin / school_admin / user
+    assigned_area: Optional[str] = None
+    assigned_school: Optional[str] = None