Backend:
- servers.py: instant connectivity check + VM cache sync after create/update;
broadcast server_added/updated/deleted events via WebSocket
- websocket_manager: add broadcast_event() helper for global fire-and-forget events
Frontend:
- use-nodes: invalidate topology, VM list and resources after server create/update/delete
- use-realtime-sync: new hook with useGlobalRealtimeSync subscribing to server_*
WS events and invalidating relevant React Query caches
- AppLayout: mount useGlobalRealtimeSync globally
Deploy:
- deploy.sh: auto-install pve CLI during main/quick deploy (idempotent, --auto mode)
- AttributeError: OSTemplate has no 'template_vmid' field; the actual column is 'vmid'.
- Use OSTemplate.get_vmid_for_node() to support cross-node replicated templates,
falling back to source_node/vmid otherwise.
- VMInstance.memory is stored in bytes, but Proxmox config expects MB.
