- Track active fight IDs per bot in orchestrator (Set → Map)
- Return fightId in "already in fight" error responses (409)
- Frontend shows "REJOIN FIGHT" link instead of generic error
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add /api/payments router (connect-wallet, wallet-status, create-invoice,
check, submit-cashu, winnings, claim, disconnect-wallet). Add ranked
queue endpoints to /api/queue. Mount payments router in app.ts with
orphan payment recovery on startup.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>