Minro refactoring for consistancy sake (#102)

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Co-authored-by: Tianjing Li <tianjinglimail@gmail.com>

src/backend/routers/user.py

@@ -123,4 +123,4 @@ def delete_user(user_id: str, session: DBSessionDep) -> DeleteUser:
 
     user_crud.delete_user(session, user_id)
 
-    return {}
+    return DeleteUser()