Add duplicate file detection; show skip message in UI

Fix Gemini model name: use gemini-1.5-flash-latest

Fix: downgrade to gemini-1.5-flash (free tier, 2.0-flash has 0 quota)

Fix critical bugs: BM25 scoring, provider switch data loss, LLM timeouts, CSS

Fix Gemini model: gemini-1.5-flash-001 → gemini-2.0-flash

Update RAG system: universal document chatbot, Gemini support, fix dependencies

Fix Gemini 404 error: update model name and version

Update RAG system to v2.0 with Gemini support

Fix prompt: remove banking-only framing, support any document type

Add DOCX support + e5-small on HF Spaces for 5x faster indexing

Fix: in-memory ChromaDB on HF Spaces + batch indexing for large docs

Fix readonly DB on HuggingFace Spaces: use /tmp/chroma_db

Fix hallucination on yes/no questions

Universal prompt: works for any banking document type

Fix CoT prompt: apply free periods in multi-step cost calculations

Banking RAG system - initial deploy