v0.11.8 — Per-App Cross-Drive Backup (3-2-1 rule)

New feature: backup app data to a secondary storage drive to satisfy
the "different media" requirement of the 3-2-1 backup rule.

- settings.go: CrossDriveBackup struct, AppBackupPrefs.CrossDrive field,
  getter/setter methods, GetOrCreateCrossDrivePassword, preserves
  cross-drive config when toggling nightly backup

- crossdrive.go (new): CrossDriveRunner with rsync and restic backends.
  Validates destination (mount point, writable), prevents source/dest
  overlap, per-app concurrency lock, persists last_run/status/size.

- main.go: wire CrossDriveRunner, register cross-drive-daily (03:30)
  and cross-drive-weekly (04:30 Sundays) scheduler jobs

- router.go: 4 new API endpoints — save config, trigger run, get status,
  run-all. Router now accepts Settings and CrossDriveRunner.

- server.go: Server struct accepts CrossDriveRunner, new web route
  POST /settings/cross-backup/{name}

- handlers.go: deployHandler populates CrossDriveConfig, BackupDestPaths,
  BackupDestWarning, AppBackupEnabled. settingsCrossBackupHandler saves
  config. backupsHandler builds CrossDriveSummary, UnconfiguredApps,
  CrossDriveWarnings for backup page.

- deploy.html: "Biztonsági mentés" card with destination/method/schedule
  dropdowns, last-run status, manual trigger button, flash messages.

- backups.html: "Másolatok másik meghajtóra" section with per-app
  status rows, unconfigured app warnings, "Összes futtatása most" button.

- style.css: margin-bottom fix for .deploy-stale-data, new cross-drive
  card and list styles.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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## Changelog
### What was just completed (2026-02-17 session 35)
- **v0.11.8 — Per-App Cross-Drive Backup (3-2-1 rule, second copy on different media):**
- **Feature: CrossDriveBackup data model** — `AppBackupPrefs` extended with `CrossDrive *CrossDriveBackup` field in `settings.go`. New methods: `GetCrossDriveConfig`, `SetCrossDriveConfig`, `UpdateCrossDriveStatus`, `GetAllCrossDriveConfigs`, `GetOrCreateCrossDrivePassword`. Existing `SetAppBackup`/`SetAppBackupBulk` now preserve cross-drive config. Auto-generated restic password stored in `settings.json`.
- **Feature: CrossDriveRunner** — New `internal/backup/crossdrive.go`. Supports rsync (simple mirror with `--delete`) and restic (versioned, deduplicated, shared repo). Safety guards: destination ≠ source, mount point check, writable check, per-app concurrency lock. `RunAllScheduled(ctx, schedule)` iterates all apps matching the given schedule. Status (last_run, last_status, last_error, last_duration, last_size_human) persisted to settings.json after each run.
- **Feature: Scheduler jobs** — Two new daily jobs: `cross-drive-daily` at 03:30 (for apps with `schedule: daily`), `cross-drive-weekly` at 04:30 Sundays only (for `schedule: weekly`).
- **Feature: API endpoints** — 4 new routes: `POST /api/stacks/{name}/cross-backup`, `POST /api/stacks/{name}/cross-backup/run`, `GET /api/stacks/{name}/cross-backup/status`, `POST /api/backup/cross-drive/run-all`.
- **Feature: Deploy/Settings page UI** — New "Biztonsági mentés" card on the deploy page for apps with HDD data. Shows nightly backup toggle (read-only link), cross-drive dropdowns (destination, method, schedule), last run status, manual trigger button. States: no other storage (info message), configured, destination unreachable (warning). Flash messages on save redirect.
- **Feature: Backup page summary** — New "Másolatok másik meghajtóra" section showing all configured apps with method, destination, last status, size. Warns about unconfigured apps with HDD data. Destination health warnings. "Összes futtatása most" button.
- **CSS:** `margin-bottom: 1.5rem` added to `.deploy-stale-data`. New styles: `.deploy-cross-drive`, `.cross-drive-list`, `.cross-drive-item`, `.cross-drive-header`, `.cross-drive-meta`, `.cross-drive-actions`.
- **Files modified (10):** `settings/settings.go`, `backup/crossdrive.go` (new), `backup/backup.go`, `api/router.go`, `web/handlers.go`, `web/server.go`, `web/templates/deploy.html`, `web/templates/backups.html`, `web/templates/style.css`, `cmd/controller/main.go`
### What was just completed (2026-02-17 session 34)
- **v0.11.7 — Stale Data Cleanup + FileBrowser Sync + UI Title Fix:**
- **Feature: Stale data cleanup** — After app data migration, the deploy/settings page now shows leftover data on previous storage paths with size info and a delete button. Two-step confirmation required before deletion. Protected paths (storage root, media, Dokumentumok, appdata) cannot be deleted. Also available immediately after migration on the migration-done page.