feat(instances): add VM/LXC migration, autostart/boot order, protection
- Migrate VMs/LXCs between cluster nodes with live progress tracking - Configure autostart, boot order, startup/shutdown delays, and delete protection from the instance settings tab - Group OS templates by detected OS (Ubuntu, AlmaLinux, etc.) instead of a single "Cloud Images" bucket - Expand native Proxmox backup job management (schedule, compression, retention, guest selection, notifications) - Add ru/en translations for the above
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