Adds FreshHours and StaleHours settings to control when the dashboard
backup indicator shows green (fresh), amber (stale), or red (critical).
- Backend: Added FreshHours/StaleHours to BackupAlertConfig (default 24/72 hours)
- Frontend: getBackupInfo() now accepts optional thresholds parameter
- Dashboard/GuestRow components use thresholds from alert config
- Settings saved/loaded with alert configuration
Closes#839
- Add Claude OAuth authentication support with hybrid API key/OAuth flow
- Implement Docker container historical metrics in backend and charts API
- Add CEPH cluster data collection and new Ceph page
- Enhance RAID status display with detailed tooltips and visual indicators
- Fix host deduplication logic with Docker bridge IP filtering
- Fix NVMe temperature collection in host agent
- Add comprehensive test coverage for new features
- Improve frontend sparklines and metrics history handling
- Fix navigation issues and frontend reload loops
