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/services/backup_scheduler.py

@@ -156,7 +156,8 @@ async def run_backup_job(job_id: int) -> None:
                     storage=job.storage,
                     mode=job.mode,
                     compress=job.compress,
-                    remove=job.keep_last,
+                    remove=1 if job.keep_last else 0,
+                    keep_last=job.keep_last,
                     notes=job.notes,
                 )
                 if result.get("success"):