- Fixed 'Unhealthy components detected: api_client' warning by implementing comprehensive heartbeat system
- Added heartbeat calls in main loop, HTTP requests, database operations, and error handling
- Added betting mode configuration UI in web dashboard with database persistence
- Created Migration_015_AddBettingModeTable for betting_modes table
- Added betting mode API endpoints (GET/POST /api/betting-mode)
- Updated documentation with betting mode configuration and API client health monitoring
- Enhanced error handling to prevent thread hangs and maintain health status
- Added troubleshooting section for API client health issues