Add catatonit/nftables/docker-compose packages, fix CSRF/streaming/storage bugs found by live testing

- Package #9-11: catatonit (pod infra init), nftables (netavark firewall
  backend), docker-compose (external compose provider for `podman compose`)
  — all vendored prebuilt binaries, versions.env pinned, propagated through
  build-packages.sh/release.sh/podman.plg/verify+update-packages.sh.
- Fix WebUI: every POST action was silently failing (empty response body)
  because Unraid's own CSRF protection was never satisfied — app.js now
  sends the page's csrf_token as X-CSRF-Token.
- Fix WebUI: PodmanClient::pullImage() assumed a single JSON response, but
  /images/pull actually streams newline-delimited JSON — every successful
  pull was throwing "Expected a JSON object/array response".
- Fix WebUI: compose.php's up/down status detection had the same
  single-JSON-vs-NDJSON bug for `podman compose ps`, plus stderr was
  corrupting the parse.
- Add cache-busting (?v=<mtime>) to Podman.page's script/style tags so a
  redeployed JS/CSS fix isn't served stale from browser cache.
- Add a reusable modal dialog (app.js openFormModal) replacing
  prompt()/alert() for New Volume/Network/Pull Image.
- Add host-path (bind-mount) support when creating a named volume.
- Add Create Container (image, name, network mode incl. custom networks,
  ports, volumes, env, restart policy, privileged, start-after-create),
  auto-pulling the image on first use since /containers/create doesn't.

All fixes verified live against a real podman system service and, where
reachable, via the actual WebUI over the real socket — not just unit-level.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

docs/ARCHITECTURE.md

@@ -232,6 +232,8 @@ wählen können — mit deutlicher GUI-Warnung bzgl. Performance und Spin-up-Ver
 | `fuse-overlayfs` | Fallback-Storage-Driver | Für Rootless-Phase 2 vorbereitet, in Phase 1 optional |
 | `passt`/`pasta` | Rootless-Networking | Nachfolger von slirp4netns, Phase 2, aber Paket schon mitbauen (geringe Kosten) |
 | `catatonit` oder `tini` | Init-Prozess in Containern (optional, falls von Templates genutzt) | |
+| `nftables` | Firewall-Backend für `netavark` | Pflicht seit netavark 2.0 (iptables-Treiber entfernt); Unraid liefert kein `nft` mit — als offizielles Slackware-Paket vendored, nicht selbst gebaut |
+| `docker-compose` (CLI-Plugin) | External-Compose-Provider für `podman compose` | `podman compose` hat keine eigene Compose-Implementierung, sondern sucht ein `docker-compose`-Binary in festen CLI-Plugin-Pfaden; ohne dieses Paket schlägt jede Compose-Panel-Aktion auf einem frischen Unraid-Install fehl |
 
 ### 5.2 Build-Strategie