Customizon on chunking stratergy

Merge branch 'main' into claude/reverent-einstein-d9c1a3

fix: make redis optional and use sentence-transformers for embeddings on Spaces

fix(ruff): remove unused qdrant lazy imports in database.py

fix: make qdrant_client imports lazy in database.py

Merge branch 'main' into phase-2-hybrid-retrieval

feat: add API orchestration and citation-aware RAG flow

Fix ruff lint errors: sort imports and wrap long lines

Phase 1 Infrastructure Tasks complete

Add Docker setup, integration tests, and rename requirements file

initiall commit - Phase 1 core infrastructure