feat: add database session dependency for FastAPI routes

- Introduced a new dependency in `middleware/dependencies.py` to provide an asynchronous database session using SQLModel.
- This dependency can be utilized in route functions to facilitate database operations.

routers/controllers/admin.py

@@ -1,5 +1,7 @@
 from fastapi import APIRouter, Depends
+
 from middleware.auth import AdminRequired
+from middleware.dependencies import SessionDep
 from models import User
 from models.response import ResponseModel
 
@@ -273,31 +275,30 @@ def router_admin_get_users(
     dependencies=[Depends(AdminRequired)],
 )
 async def router_admin_create_user(
-    user: User
+    session: SessionDep,
+    user: User,
 ) -> ResponseModel:
     """
     创建一个新的用户，设置用户名、密码等信息。
-    
+
     Returns:
         ResponseModel: 包含创建结果的响应模型。
     """
     try:
-        existing_user = await User.get(email=user.email)
+        existing_user = await User.get(session, User.username == user.username)
         if existing_user:
             return ResponseModel(
-                code=400, 
-                message="User with this email already exists."
+                code=400,
+                message="User with this username already exists."
             )
-        await user.create(**user.model_dump())
+        await user.save(session)
     except Exception as e:
         return ResponseModel(
             code=500,
             message=str(e)
         )
     else:
-        return ResponseModel(
-            data=user.model_dump()
-        )
+        return ResponseModel(data=user.model_dump())
 
 @admin_user_router.patch(
     path='/{user_id}',