feat: v1.1.0 — backup module, IPAM node binding, HA, task queue, theme CSS

- Backup module: full CRUD for storages, backup files, scheduled jobs (APScheduler)
- Proxmox client: storage/backup/restore/HA methods
- IPAM: proxmox_node field, server+node binding for networks and allocations
- Task queue service: improvements and new task types
- Monitoring worker: extended metrics and alerts
- HA support: add/remove VMs from Proxmox HA groups
- tasks.html: new task tracking page
- proxmox_vms.html: major UI update (bulk ops, HA, snapshots)
- backups.html: full backup management UI (3 tabs)
- base.html: sidebar backup link, websocket manager
- theme.css: full CSS variables theme, 395 lines added
- migrations: migration #15 (BackupJob), #16 (proxmox_node)
- RBAC: backup resource permissions
- websocket_manager.py: new module for WS connections

backend/app/rbac/permissions.py

@@ -240,6 +240,13 @@ def _create_permissions() -> PermissionRegistry:
         category="Proxmox Servers",
         requires=["server:view"]
     ))
+    registry.register(Permission(
+        resource="cluster", action="manage",
+        display_name="Manage Cluster Topology",
+        description="Create clusters, join nodes, eject nodes from cluster",
+        category="Proxmox Servers",
+        requires=["server:view"]
+    ))
     
     # VM permissions
     registry.register(Permission(
@@ -619,6 +626,7 @@ LEGACY_PERMISSION_MAP = {
     "proxmox.servers.add": "server:create",
     "proxmox.servers.edit": "server:update",
     "proxmox.servers.delete": "server:delete",
+    "proxmox.cluster.manage": "cluster:manage",
     "proxmox.vm.manage": "vm:manage",
     "vms.view": "vm:view",
     "vms.create": "vm:create",