- Add CRUD API for llmcatelog (list/create/update/delete)
- Add llmcatelog.ui as main entry for catalog management
- Add llmcatelog_list.ui as DataViewer interface
- Add index.ui as module navigation page
- Update json/llmcatelog.json with editable section
- Create llm_catalog_rel model for one-to-many relationship
- Remove llmcatelogid from llm model
- Update SQL queries in utils.py and dspy files to use join
- Add maintenance UI (llm_catalog_rel_manage.ui) and API endpoints
- Filter options by user's orgid
