- Update GEMINI.md with verification steps and remove ignored docs reference
- Update README.md to remove reference to local langchain-docs
- Update backend/GEMINI.md with correct database schema (users table) and architecture details
- Update frontend/GEMINI.md with latest project structure
- Refactored OIDC flow to implement PKCE, state/nonce validation, and BFF pattern.
- Centralized configuration in Settings class (DEV_MODE, FRONTEND_URL, OIDC_REDIRECT_URI).
- Updated auth routers to use conditional secure cookie flags based on DEV_MODE.
- Modernized and cleaned up test suite by removing legacy Streamlit tests.
- Fixed linting errors and unused imports across the backend.
