* feat: data annotation page adaptation to the backend API. * feat: Implement labeling configuration editor and enhance annotation task creation form
* feature: implement endpoints with multi-level response models * refactor: move `/health` and `/config` endpoints to system module, remove example from base schemas * refactor: remove unused get_standard_response_model()
refactor: Reorganize datamate-python (previously label-studio-adapter) into a DDD style structure.