fix(app):

1.The end users are still bound to the app.
2. Multi-modal file support includes xlsx, csv, and json.
3. The file routing protocol is consistent with the page routing.

api/app/controllers/service/app_api_controller.py

@@ -94,6 +94,7 @@ async def chat(
     workspace_id = app.workspace_id
     end_user_repo = EndUserRepository(db)
     new_end_user = end_user_repo.get_or_create_end_user(
+        app_id=app.id,
         workspace_id=workspace_id,
         other_id=other_id,
     )