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/web/templates/backups.html

@@ -283,6 +283,57 @@
 </div>
 {{end}}
 
+<!-- Section 4b: Cross-drive backups -->
+{{if or .Backup.CrossDriveSummary .Backup.UnconfiguredApps}}
+<div class="backup-section-card">
+    <h3>Másolatok másik meghajtóra</h3>
+    <p class="backup-section-desc">Alkalmazás adatok biztonsági másolata külső meghajtóra (3-2-1 szabály).</p>
+
+    {{if .Backup.CrossDriveWarnings}}
+    <div style="margin-bottom:1rem">
+        {{range .Backup.CrossDriveWarnings}}
+        <div class="alert alert-warning" style="margin-bottom:.5rem">{{.}}</div>
+        {{end}}
+    </div>
+    {{end}}
+
+    {{if .Backup.CrossDriveSummary}}
+    <div class="cross-drive-list" style="margin-bottom:1rem">
+        {{range .Backup.CrossDriveSummary}}
+        <div class="cross-drive-item">
+            <div class="cross-drive-header">
+                <a href="/stacks/{{.StackName}}/deploy" class="cross-drive-name">{{.DisplayName}}</a>
+                <div class="cross-drive-meta">
+                    <span class="meta-badge">{{.MethodLabel}}</span>
+                    {{if .DestLabel}}<span class="meta-badge meta-badge-storage">→ {{.DestLabel}}</span>
+                    {{else if .DestPath}}<span class="meta-badge meta-badge-storage">→ {{.DestPath}}</span>{{end}}
+                    {{if eq .LastStatus "ok"}}<span class="meta-badge meta-badge-ok">✅ {{.LastRunShort}}</span>
+                    {{else if eq .LastStatus "error"}}<span class="meta-badge meta-badge-fail">❌ Hiba</span>
+                    {{else if eq .LastStatus "running"}}<span class="meta-badge">⏳ Fut...</span>
+                    {{else}}<span class="meta-badge" style="color:var(--text-muted)">⏰ {{.ScheduleLabel}}</span>{{end}}
+                    {{if .SizeHuman}}<span class="mono" style="font-size:.8rem;color:var(--text-muted)">{{.SizeHuman}}</span>{{end}}
+                </div>
+            </div>
+        </div>
+        {{end}}
+    </div>
+    {{end}}
+
+    {{if .Backup.UnconfiguredApps}}
+    <div style="font-size:.85rem;color:var(--yellow);margin-bottom:1rem">
+        ⚠️ {{len .Backup.UnconfiguredApps}} alkalmazáshoz nincs beállítva:
+        {{range .Backup.UnconfiguredApps}}
+        <a href="/stacks/{{.StackName}}/deploy" style="color:var(--accent-blue)">{{.DisplayName}}</a>
+        {{end}}
+    </div>
+    {{end}}
+
+    <div class="cross-drive-actions">
+        <button class="btn btn-sm btn-primary" onclick="triggerAllCrossDrive(this)">Összes futtatása most</button>
+    </div>
+</div>
+{{end}}
+
 <!-- Section 5: Snapshots -->
 <div class="backup-section-card">
     <h3>Pillanatképek</h3>
@@ -432,6 +483,28 @@
 {{end}}
 
 <script>
+function triggerAllCrossDrive(btn) {
+    btn.disabled = true;
+    btn.textContent = 'Indítás...';
+    fetch('/api/backup/cross-drive/run-all', {method: 'POST'})
+    .then(function(r) { return r.json(); })
+    .then(function(d) {
+        if (!d.ok) {
+            alert('Hiba: ' + (d.error || 'Ismeretlen hiba'));
+            btn.disabled = false;
+            btn.textContent = 'Összes futtatása most';
+            return;
+        }
+        btn.textContent = '⏳ Mentések futnak...';
+        setTimeout(function() { location.reload(); }, 5000);
+    })
+    .catch(function(e) {
+        alert('Hálózati hiba: ' + e.message);
+        btn.disabled = false;
+        btn.textContent = 'Összes futtatása most';
+    });
+}
+
 function triggerBackupFromPage() {
     const btn = document.getElementById('backup-page-btn');
     btn.disabled = true;