[KM-560][KM-561] drop catalog LLM enrichment + rename store to data_catalog + add /data-catalog index endpoint

[KM-553] migrate retrieval layer and remove obsolete rag/tools modules

initial structure

Merge dev_new to main (improve retriever and add querying) (#13)

[KM-436][KM-437] add and modify for database and document pipeline (#3)

[KM-467] [DED][AI] Orchestration Agent - Init