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/Dockerfile

@@ -45,6 +45,10 @@ FROM debian:bookworm-slim
 # - sqlite3: for SQLite backup
 # - git: for stack sync from Gitea
 # - curl: for health pings and debugging
+# - util-linux: lsblk, blkid, sfdisk, mount (storage init)
+# - e2fsprogs: mkfs.ext4 (filesystem formatting)
+# - rsync: for data migration between storage paths
+# - parted: partprobe (partition table re-read after sfdisk)
 RUN apt-get update && apt-get install -y --no-install-recommends \
     ca-certificates \
     curl \
@@ -54,6 +58,10 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     postgresql-client \
     default-mysql-client \
     sqlite3 \
+    util-linux \
+    e2fsprogs \
+    rsync \
+    parted \
     && rm -rf /var/lib/apt/lists/*
 
 # Install docker-cli (without daemon)