Add stack-type=dev-only labels to dev stacks

Label stacks that should only run on ubuntu-dev:
- bookclub, dockge, filebrowser, meshmon, meshtastic-web
- mllogwatcher, network-mcp, obby, obsidian-tools
- syncthing, szurubooru

These will now be filtered by the updated workflow.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

stacks/dockge/docker-compose.yml

@@ -14,6 +14,7 @@ services:
     networks:
       - web
     labels:
+      - "com.ghost.tel/stack-type=dev-only"
       - "traefik.enable=true"
       - "traefik.http.routers.dockge.rule=Host(`dockge.${DOMAIN}`)"
       - "traefik.http.routers.dockge.entrypoints=https"