Support Ollama (#261)

### What problem does this PR solve?

Issue link:#221

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

api/apps/user_app.py

@@ -181,6 +181,10 @@ def user_info():
 
 
 def rollback_user_registration(user_id):
+    try:
+        UserService.delete_by_id(user_id)
+    except Exception as e:
+        pass
     try:
         TenantService.delete_by_id(user_id)
     except Exception as e: