37ff296a0d
New /backups page with full backup system visibility: - Status overview cards (local/remote backup, DB count, repo size) - Schedule section with next-run times and retention policy - Database table with type, size, validation (table count), status - Snapshot history table with per-snapshot stats - Repository info card with paths, integrity status, remote placeholder - "Mentés most" button with auto-refresh polling - Empty state when backup not configured Backend: SnapshotRecord history (ring buffer), DumpValidation, ListDumpFiles, ListSnapshots, GetFullStatus, restic check tracking. Server accepts scheduler for next-run time calculation. Sidebar nav updated with 3rd item, dashboard backup card title clickable. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>