v0.11.0 — Phase C: Storage Init Wizard, Data Migration & Startup Fix

- Startup ping: fire heartbeat + health + hub report immediately on boot
  (5s delay after scheduler start, instead of waiting 5-15 min for first tick)

- Storage init wizard: new internal/storage/ package with disk scanning
  (lsblk -J), format+mount pipeline (sfdisk → mkfs.ext4 → blkid → fstab →
  mount → chown), safety guards (system disk detection, confirmation "FORMÁZÁS"),
  progress channel, auto-register in settings.json

- Data migration: MigrateAppData() with rsync --info=progress2 progress parsing,
  stop/rsync/update-config/start flow, rollback on failure, old data preserved

- New pages: /settings/storage/init (wizard), /stacks/{name}/migrate (migration)
- New API routes: /api/storage/{scan,init,init/status,migrate,migrate/status}
- Deploy page: storage info section for deployed apps (path, size, free, migrate link)
- Settings page: "Mozgatás" button per app in storage path details
- Container: privileged: true, /dev:/dev, /etc/fstab:/host-fstab, /run/udev:/run/udev:ro
- Dockerfile: add util-linux, e2fsprogs, rsync, parted for disk ops

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

controller/internal/web/templates/deploy.html

@@ -30,6 +30,34 @@
     <div class="alert alert-info">
         Ez az alkalmazás már telepítve van. Az alábbi beállítások csak olvashatók.
     </div>
+    {{if .StorageInfo}}
+    <div class="deploy-storage-info">
+        <h4>Adattárolás</h4>
+        <div class="settings-grid">
+            <div class="settings-row">
+                <span class="settings-label">Tárhely</span>
+                <span class="settings-value">{{.StorageInfo.Label}} <span class="mono" style="color:var(--text-secondary)">({{.StorageInfo.Path}})</span></span>
+            </div>
+            {{if .StorageInfo.DataSizeHuman}}
+            <div class="settings-row">
+                <span class="settings-label">Adatméret</span>
+                <span class="settings-value mono">{{.StorageInfo.DataSizeHuman}}</span>
+            </div>
+            {{end}}
+            {{if .StorageInfo.FreeHuman}}
+            <div class="settings-row">
+                <span class="settings-label">Szabad hely</span>
+                <span class="settings-value mono">{{.StorageInfo.FreeHuman}} ({{printf "%.0f" .StorageInfo.FreePercent}}% szabad)</span>
+            </div>
+            {{end}}
+        </div>
+        {{if .OtherStoragePaths}}
+        <a href="/stacks/{{.Meta.Slug}}/migrate" class="btn btn-sm btn-outline" style="margin-top:.75rem">
+            📦 Mozgatás másik tárolóra
+        </a>
+        {{end}}
+    </div>
+    {{end}}
     {{end}}
 
     {{if and (not .AlreadyDeployed) .MemoryInfo}}