Fix evaluation metrics zero display, document picker stale count, and auto-save evaluation reports

Optimize RAG evaluation to unified single LLM call, increase timeouts, and handle 429 quota limits

chore: sync project updates

Major Chunking,Retrieval and Ranking Updates

Refactored the codebase and implemented stateless

feat: add auth-gated 3-mode workflow with admin chroma controls

Implemented Compare feature and fixed other chunking strats