v0.22.1: Fix setup wizard bugs (detection, CSRF panic, version display, IP)

- NeedsSetup: only check for empty customer.id (not "demo-felhom")
- renderError: pass *http.Request to ensureCSRFToken (was nil → panic)
- Welcome template: remove redundant "v" prefix from version display
- IP detection: read HOST_IP env var for Docker container awareness
- docker-setup.sh: inject HOST_IP into generated docker-compose.yml
- Add logging for Hub config download in setup wizard

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

scripts/docker-setup.sh

@@ -1528,6 +1528,7 @@ services:
       - /run/udev:/run/udev:ro
     environment:
       - TZ=Europe/Budapest
+      - HOST_IP=$(get_server_ip)
     labels:
       - "traefik.enable=true"
       - "traefik.http.routers.controller.rule=Host(\`felhom.${BASE_DOMAIN}\`)"