- New eterra-health.ts service: pings eTerra periodically (3min),
detects maintenance (503, keywords), tracks consecutive failures
- New /api/eterra/health endpoint for explicit health queries
- Session route blocks login when eTerra is in maintenance (503 response)
- GET /api/eterra/session now includes eterraAvailable/eterraMaintenance
- ConnectionPill shows amber 'Mentenanță' state with AlertTriangle icon
instead of confusing red error when eTerra is down
- Auto-connect skips when maintenance detected, retries when back online
- 30s session poll auto-detects recovery and re-enables auto-connect