Add test-bot.js script that simulates a user participating in event chat for testing purposes.
Features:
- Authenticates as user via API
- Checks in to event using QR code token
- Connects to Socket.IO and joins event room
- Sends random messages at configurable intervals
- Auto-accepts recording suggestions
Usage from container:
docker compose exec backend sh -c 'API_URL=http://localhost:3000 node scripts/test-bot.js --email user@example.com --password pass --slug event-slug --interval 10'
