Need to add a feature to append a suffix to class names, as model classes

[Junix]

We need to add a feature to append a suffix to class names, as model classes in most projects end with "model" or "entity". Currently, the generated classes do not have this suffix, and it has to be added manually. This feature is very much needed. Please note that the data returned by the backend API often has a nested structure, so all generated classes should include this suffix. Thank you.