- Add Backup model to Prisma schema with fields for container_id, server_id, hostname, backup info
- Create backupService with discovery methods for local (/var/lib/vz/dump/) and storage (/mnt/pve/<storage>/dump/) backups
- Add database methods for backup CRUD operations and grouping by container
- Create backupsRouter with getAllBackupsGrouped and discoverBackups procedures
- Add BackupsTab component with collapsible cards grouped by CT_ID and hostname
- Integrate backups tab into main page navigation
- Filter storages by node hostname matching to only show applicable storages
- Skip PBS backups discovery (temporarily disabled)
- Add comprehensive logging for backup discovery process
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