Add scheduled backup for postgres

platform/data/cnpg/scheduled-backup.yaml

@@ -0,0 +1,13 @@
+apiVersion: postgresql.cnpg.io/v1
+kind: ScheduledBackup
+metadata:
+  name: agentic-os-pg-daily-backup
+  namespace: platform-data
+  labels:
+    agentic-os.io/layer: data
+    agentic-os.io/component: postgres
+spec:
+  schedule: "0 0 0 * * *"
+  backupOwnerReference: self
+  cluster:
+    name: agentic-os-pg