feat(storage): add Supabase object storage and reduce exposed API surface

[KM-418]feat: align analysis flow contracts and scoped catalog rebuild

[KM-590][DED][AI] Enhance data catalog: column stats, XLSX multi-sheet parquet, upload observability

[KM-573] [DED][AI] Migration Endpoint Group Documents & Knowledge- Diagnose & mitigate slow upload on Windows loopback

[KM-467] [DED][AI] Go service full migration — add auth, rooms, documents, DB clients, catalog modules, DB init, and user seeder