Add data directory structure with .gitkeep files and usage instructions

Remove public demo link, add Kiro config to gitignore, update README for self-deployment

Security improvements: Enhanced README, added .env.example, removed docs from tracking

clean git cache

feat: Update Streamlit to 1.41.0 and add browser compatibility note

test: Initial minimal test setup

test: Simplify to bare minimum Streamlit setup

docs: Update README and Streamlit config for HF deployment

Initial commit for cleanstart2