- Implement two-factor authentication with TOTP verification, recovery codes, and QR code setup in auth flow
- Add is_starred and last_accessed_at fields to File and Folder models for bookmarking and recency tracking
- Introduce batch operation endpoints for files and folders (delete, star, unstar, move, copy)
- Configure structured logging with timestamps and module names, replacing print statements
- Register admin and starred routers, add global HTTPException handler with JSON error responses
- Update authenticate_user and create_access_token to handle 2FA verification and token claims
