feat: orphan stack detection/deletion, filebrowser infra, setup scripts

- Add orphan detection: stacks not in catalog marked as "Elavult"
- Add DELETE /api/stacks/{name} endpoint with HDD data handling
- Add GET /api/stacks/{name}/hdd-data endpoint
- Add delete confirmation modal with HDD data checkbox (Hungarian UI)
- Add filebrowser to protected stacks list
- Add scripts/hdd-setup.sh and scripts/docker-setup.sh for node setup
- Hide "Frissítés" and "Részletek" buttons for orphaned stacks

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

controller/configs/controller.yaml.example

@@ -53,6 +53,7 @@ stacks:
     - "traefik"
     - "cloudflared"
     - "felhom-controller"
+    - "filebrowser"
   update_window: "03:00-05:00"
   compose_command: ""