Add PVC/PV restore step to infrastructure-only workflow

Add PVC restore step in the workflow after infrastructure is ready but
before database restore. This ensures PVCs are restored while services
are paused in infrastructure-only mode.

The flow is now:
1. Infrastructure Ready (creates empty PVCs)
2. Restore PVCs/PVs from OADP or other backup method
3. Restore database contents (MariaDB, OVN)
4. Resume deployment

This aligns with the OADP integration documentation where PVC restore
happens after InfrastructureReady condition but before resuming deployment.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: stuggi

docs/dev/backup-restore-ctlplane.md

@@ -147,7 +147,8 @@ flowchart TD
     WaitInfra -->|Not Ready| WaitInfra
     WaitInfra -->|Ready| InfraReady[Infrastructure Ready:<br/>✓ Galera<br/>✓ OVN NB/SB<br/>✓ RabbitMQ<br/>✓ Memcached]
 
-    InfraReady --> RestoreMariaDB[Restore MariaDB Database Contents]
+    InfraReady --> RestorePVC[Restore PVCs/PVs<br/>From OADP or other backup method<br/>Optional: only if PVC data backed up]
+    RestorePVC --> RestoreMariaDB[Restore MariaDB Database Contents]
     RestoreMariaDB --> RestoreOVN[Restore OVN Database Contents<br/>NB & SB databases]
     RestoreOVN --> RestoreRabbitMQ[Restore RabbitMQ User Credentials<br/>for EDPM compatibility]
 
@@ -165,6 +166,7 @@ flowchart TD
     style InfraReady fill:#90EE90
     style ServicesReady fill:#90EE90
     style RestoreCtlPlane fill:#FFE4B5
+    style RestorePVC fill:#FFE4B5
     style Resume fill:#FFE4B5
     style WaitInfra fill:#87CEEB
     style WaitServices fill:#87CEEB
@@ -174,9 +176,10 @@ flowchart TD
 - **Prerequisites**: Cluster infrastructure must exist first (StorageClass, NNCP, MetalLB) - either still present or restored separately
 - **Staged Deployment**: Infrastructure (databases, message queue) is created first with annotation `core.openstack.org/deployment-stage: "infrastructure-only"`
 - **OpenStackControlPlaneInfrastructureReady Condition**: Single condition check validates all infrastructure components are ready
+- **PVC Restore**: After infrastructure is ready, PVCs are created (but empty). Restore PVC data from OADP or other backup method while services are paused
 - **Database Restore**: Performed while OpenStack services are NOT yet created (clean restore)
 - **Resume Deployment**: Removing the `core.openstack.org/deployment-stage` annotation triggers creation of OpenStack services
-- **Services Start Clean**: Keystone, Nova, etc. start with already-restored databases (no restarts needed)
+- **Services Start Clean**: Keystone, Nova, etc. start with already-restored databases and PVCs (no restarts needed)
 
 **Staged Deployment Feature**: The staged deployment mechanism using the `core.openstack.org/deployment-stage` annotation is a key feature for reliable restores. For detailed context on why this feature was implemented and how it works, see [enhancement-staged-deployment-restore.md](enhancement-staged-deployment-restore.md).