minecraft: add hourly world backup CronJob with 3-day local retention

cluster/applications/minecraft/backup-pvc.yaml

@@ -0,0 +1,19 @@
+---
+# Minecraft backup storage — local hourly backups, 3-day retention
+# Sized for ~72 backup tarballs; world data compresses well (~90% reduction typical)
+# Long-term retention handled by Pure FlashArray protection group snapshots (utilidor)
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: papermc-backups
+  namespace: minecraft
+  labels:
+    app.kubernetes.io/name: minecraft
+    app.kubernetes.io/component: backup
+spec:
+  accessModes:
+    - ReadWriteOnce
+  storageClassName: px-fa-direct-access
+  resources:
+    requests:
+      storage: 10Gi