- Fixed critical Ctrl+C signal handler - now exits gracefully with single press
- Fixed API token display issue - tokens now properly show in modal dialog after creation
- Fixed user creation and management - users now save properly and display immediately
- Fixed SQLAlchemy session binding issues causing data access errors
- Added permanent token deletion functionality (revoke now deletes completely)
- Added missing ConfigManager.update_section() method for web dashboard settings
- Enhanced frontend with professional modal dialogs and proper error handling
- Optimized shutdown process with reduced timeouts for faster exit
- Updated comprehensive documentation with troubleshooting guide
- Added detailed CHANGELOG.md documenting all improvements

Technical improvements:
- All database operations now extract data before session closure
- Enhanced signal handling flow: signal → shutdown event → cleanup → exit
- Section-based configuration management with nested support
- Improved session lifecycle management across all components
- Professional UI enhancements with Bootstrap modal integration