Fix sources titles + concise answers (300 tokens max)

Remove hardcoded QDRANT_URL so HF secrets can override

Make start-hf.sh more resilient

Fix check_and_ingest.py sys.path

Fix Dockerfile: use docs_copy instead of frontend submodule

Rename Dockerfile.hf to Dockerfile for HF

Add HF Space README with Docker SDK config

Restore original HF deployment with RAG search fallback fix