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>

controller/internal/backup/backup.go

@@ -53,6 +53,21 @@ type SnapshotRecord struct {
 	HasStats     bool          `json:"has_stats"` // false for historical entries loaded from restic
 }
 
+// CrossDriveSummaryItem holds display data for one app's cross-drive backup.
+type CrossDriveSummaryItem struct {
+	StackName     string
+	DisplayName   string
+	Method        string // "rsync" or "restic"
+	MethodLabel   string // "Egyszerű másolat" or "Restic"
+	DestPath      string
+	DestLabel     string // storage path label
+	Schedule      string
+	ScheduleLabel string // "Naponta" or "Hetente" or "Kézi"
+	LastStatus    string // "ok", "error", "running", ""
+	LastRunShort  string // formatted short time e.g. "03:15"
+	SizeHuman     string
+}
+
 // FullBackupStatus contains everything the backup page needs.
 type FullBackupStatus struct {
 	Enabled bool
@@ -88,6 +103,11 @@ type FullBackupStatus struct {
 	// App data backup
 	AppDataInfo []AppBackupInfo
 
+	// Cross-drive backup summary
+	CrossDriveSummary  []CrossDriveSummaryItem
+	UnconfiguredApps   []CrossDriveSummaryItem // apps with HDD data but no cross-drive config
+	CrossDriveWarnings []string                // destination health warnings
+
 	// Flash messages (set by handlers, passed through redirect)
 	FlashSuccess string
 	FlashError   string