[KM-565] sync catalog on document and db client deletion

[KM-565] fix catalog timestamps, count_distinct logic, and query debug logging

[KM-564] Edit column description in catalog to reduce token & ingestion time

[NOTICKET] cleanup PR: wire ChatHandler, drop Phase 1 remnants, implement catalog rebuild

[KM-556][KM-562] fix tabular catalog pipeline: trigger wiring, parquet upload, lazy Azure init, backfill script

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

fixes: chain singleton, parquet logger, SSE event consistency, remove double DB fetch

[KM-556] flatten document_pipeline folder into single module

TabularIntrospector + on_tabular_uploaded trigger + 31 tests

Merge commit 'refs/pr/1' of https://huggingface.co/spaces/DataEyond/Agentic-Service-Data-Eyond-Catalog into pr/1

[NOTICKET] catalog enricher + structured pipeline + on_db_registered

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

initial structure

[KM-438][KM-439] Improve Retrieval and Querying feature (#15)

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

[NOTICKET] add updated_at metadata & prevent duplicate while adding new embedding (#10)

[NOTICKET] [document]: add doctypes endpoint (#7)

[NOTICKET][DB] add endpoints for dbtypes (#6)

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