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/storage/scan.go

@@ -0,0 +1,32 @@
+package storage
+
+// BlockDevice represents a detected physical disk.
+type BlockDevice struct {
+	Name       string      // "sdb"
+	Path       string      // "/dev/sdb"
+	Size       string      // "931.5G"
+	SizeBytes  int64       // raw bytes from lsblk
+	Model      string      // "WD Elements 25A2"
+	Type       string      // "disk"
+	Removable  bool        // true for USB
+	Partitions []Partition // child partitions
+	Mounted    bool        // any partition is mounted
+}
+
+// Partition represents a partition on a block device.
+type Partition struct {
+	Name       string // "sdb1"
+	Path       string // "/dev/sdb1"
+	Size       string // "931.5G"
+	SizeBytes  int64
+	FSType     string // "ext4", "" for no filesystem
+	Label      string // filesystem label
+	UUID       string
+	MountPoint string // "" if not mounted
+}
+
+// ScanResult from disk detection.
+type ScanResult struct {
+	AvailableDisks []BlockDevice // Unmounted, non-system disks
+	SystemDisks    []BlockDevice // System/mounted disks (display only)
+}