Refactor models and routes for item management

Reorganized model structure by replacing 'object' and 'items' with a unified 'item' model using UUIDs, and moved base model logic into separate files. Updated routes to use the new item model and improved request/response handling. Enhanced user and setting models, added utility functions, and improved error handling throughout the codebase. Also added initial .idea project files and minor admin API improvements.

Co-Authored-By: 砂糖橘 <54745033+Foxerine@users.noreply.github.com>

routes/site.py

@@ -0,0 +1,20 @@
+from fastapi import APIRouter
+from model.response import DefaultResponse
+from pkg import conf
+
+Router = APIRouter(prefix='/api/site', tags=['站点 Site'])
+
+@Router.get(
+    path='/ping',
+    summary='站点健康检查',
+    description='检查站点是否在线',
+    response_model=DefaultResponse,
+    response_description='站点在线'
+)
+async def ping():
+    """
+    站点健康检查接口。
+
+    :return: Findreve 版本号
+    """
+    return DefaultResponse(data=conf.VERSION)