fix: Add cache_folder and token to SentenceTransformer

fix: Set cache_folder for SentenceTransformer to solve PermissionError

fix: Add required README.md metadata for HF Spaces

feat: Add Dockerfile and Procfile for HF Spaces deployment

modified: app.py

modified: app.py

update FE

add landing page (index.html), update CSS and app.py

feat: Add full Python backend with Flask, RAG, Mongo, and Chroma

Initial commit