Add Harbor/Ceph runbooks and align single-node Ceph docs with abr deployment.

Document registry ingress split, image mirroring, loop OSD setup, and platform integration paths.

backend/helm/cloudhost-ceph/templates/NOTES.txt

@@ -0,0 +1,23 @@
+CloudHost Ceph storage is ready (or still initializing).
+
+Profiles
+  single-node  Directory OSD on /var/lib/rook/osd — for one-node k3s (no HA)
+  multi-node   Raw disk OSDs with replication=3 — production
+
+StorageClasses created by Rook
+  rook-ceph-block   Block volumes (app PVC, DB, registry, …)
+  rook-ceph-bucket  S3-compatible buckets via ObjectBucketClaim
+
+Verify cluster health
+  kubectl -n rook-ceph exec deploy/rook-ceph-tools -- ceph status
+  kubectl get storageclass | grep rook-ceph
+  kubectl -n cloudhost-builds get obc,secret | grep -E 'app-sources|ceph-app-sources'
+
+Platform backend (after bucket sync Job completes)
+  PLATFORM_STORAGE_CLASS=rook-ceph-block
+  PLATFORM_CREATE_STORAGE_CLASS=false
+  PLATFORM_STORAGE_PROVISIONER=rook-ceph.rbd.csi.ceph.com
+
+  Mount secret cloudhost-builds/ceph-app-sources-credentials for zip upload S3 settings.
+
+Full guide: backend/helm/cloudhost-ceph/README.md and RUNBOOK-CEPH.fa.md