flights-bot worker

Manual triggers for local development:
- POST /trigger/producer - Run producer cron (enqueue tasks)
- POST /trigger/notifier - Run notifier cron (send emails)
- POST /trigger/retry - Trigger producer for retrying failed tasks
- POST /trigger/watch - Force trigger specific watch (body: {"watchId": "..."})
- POST /clear/pending-tasks - Clear pending tasks from the queue
- POST /clear/best-offer - Clear best offer for specific watch (body: {"watchId": "..."})

API endpoints:
- GET /api/watches - List watches
- GET /api/status - System status
- GET /api/data - Best offers data
- GET /health - Health check