更新数据库初始化方法，修改用户昵称字段，调整响应模型数据类型，简化站点健康检查接口，移除不必要的服务函数

model/database.py

@@ -56,14 +56,14 @@ class Database:
         提供异步上下文管理器用于直接获取数据库会话
         
         使用示例:
-            async with Database.session_context() as session:
+        >>> async with Database.session_context() as session:
                 # 执行数据库操作
                 pass
         """
         async with _async_session_factory() as session:
             yield session
 
-    async def init_db(self, url: str = ASYNC_DATABASE_URL):
+    async def init_db(self):
         """创建数据库结构"""
         async with engine.begin() as conn:
             await conn.run_sync(SQLModel.metadata.create_all)

model/migration.py

@@ -45,7 +45,7 @@ async def migration(session):
 
         admin_user = User(
             email='admin@yxqi.cn',
-            username='Admin',
+            nickname='Admin',
             password=Password.hash(admin_password),
             role=UserTypeEnum.super_admin,
             _initializing=True

model/response.py

@@ -14,7 +14,7 @@ class ResponseBase(BaseModel):
 """
 class DefaultResponse(BaseModel):
     code: int = 0
-    data: dict | list | bool | SQLModelBase | None = None
+    data: str | dict | list | bool | SQLModelBase | None = None
     msg: str = ""
 
 # FastAPI 鉴权返回模型