Fix vps-vault restore script: pod name is vps-vault-0, not vault-0

StatefulSet pod naming follows the Helm release name (vps-vault, matching
the ArgoCD Application name), not the chart's default.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

infrastructure/vps-standby/vault/manifests/restore-cronjob.yaml

@@ -67,7 +67,9 @@ data:
     #!/bin/bash
     set -euo pipefail
 
-    VAULT_POD="vault-0"
+    # StatefulSet pod name follows the Helm release name (vps-vault), not
+    # the chart's default "vault-0".
+    VAULT_POD="vps-vault-0"
     UNSEAL_KEY="$(kubectl -n vault get secret vault-unseal-key -o jsonpath='{.data.key}' | base64 -d)"
 
     vault_exec() {