Align sized cluster seeds and GET dumps with PVE wire shapes; restyle DATA panel.

- Scale small/large/big seeds (3×50 / 10×1000 / 20×2000) with proportional
  backups, snapshots, HA, replication, Ceph capacity, and OSD totals
  (10 / 100 / 500) plus matching node disks and crush/pg metadata
- Enrich handler responses for apt, certificates, qemu/lxc status, storage,
  SDN, metrics export, and related cluster/node dumps
- Flatten nested body_example fields into PARAMS and sync the request body
  via dotted paths (oVirt-style)
- Restyle DATA controls as size cards with full-width Reset to minimal /
  Refresh stats; unload reloads the minimal cluster

app/tasks/backup.py

@@ -43,6 +43,11 @@ def backup_handler(repository: TaskRepository, clock: Clock) -> TaskHandler:
             await repository.append_log(task.id, "apt update finished")
             return {"status": "OK"}
 
+        # Node/cluster ops whose durable side effects were applied by the API handler.
+        if task.task_type != "vzdump":
+            await repository.append_log(task.id, f"{task.task_type} completed")
+            return {"status": "OK"}
+
         node = str(task.payload["node"])
         vmids = [str(item) for item in task.payload.get("vmids", [])]
         storage_id = str(task.payload.get("storage") or "nfs-backup")