feat: Add CloudNativePG with B2 backups for persistent Rancher database

- Add Local Path Provisioner for storage
- Add CloudNativePG operator (v1.27.0) via Flux
- Create PostgreSQL cluster with B2 (Backblaze) auto-backup/restore
- Update Rancher to use external PostgreSQL via CATTLE_DB_CATTLE_* env vars
- Add weekly pg_dump CronJob to B2 (Sundays 2AM)
- Add pre-destroy backup hook to destroy workflow
- Add B2 credentials to Doppler (B2_ACCOUNT_ID, B2_APPLICATION_KEY)
- Generate RANCHER_DB_PASSWORD in Doppler

Backup location: HetznerTerra/rancher-backups/
Retention: 14 backups

infrastructure/addons/kustomization.yaml

@@ -10,4 +10,6 @@ resources:
   - kustomization-flux-ui.yaml
   - kustomization-observability.yaml
   - kustomization-observability-content.yaml
-  - kustomization-rancher.yaml
+  - kustomization-lpp.yaml
+  - kustomization-cnpg.yaml
+  - kustomization-rancher.yaml