Aaron Guise b523b17f30 feat: retry queue, backend healing, and zone_data persistence 🔁 ...

- worker.py: third persistent retry queue with exponential backoff (30s→30m,
  max 5 attempts); failed backends tracked per-item so retries target only the
  failing nodes; zone_data stored in DB after every successful write
- Domain model: zone_data TEXT + zone_updated_at DATETIME columns; additive
  migration applied on startup so existing deployments upgrade in place
- ReconciliationWorker: Option C healing pass — checks every configured backend
  for zone presence after each reconciliation cycle and re-queues any zone
  missing from a backend using stored zone_data, enabling automatic recovery
  from prolonged backend outages without waiting for DirectAdmin to re-push
- 82 tests, all passing

2026-02-19 14:05:22 +13:00

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