chore(docker-dev): remap Traefik to host port 9200

Host :80 collides with the sister scadabridge-traefik dev stack; bind the
OtOpcUa Traefik :80 entrypoint to host 9200 instead (admin UI now at
http://localhost:9200). Dashboard already on 8089 to avoid the same clash.

docker-dev/docker-compose.yml

@@ -248,7 +248,7 @@ services:
       - --providers.file.watch=true
       - --api.insecure=true
     ports:
-      - "80:80"
+      - "9200:80"  # host port 9200 → traefik :80 entrypoint (80 conflicts with scadabridge-traefik)
       - "8089:8080"  # 8080 conflicts with the sister scadalink dev stack
     volumes:
       - ./traefik-dynamic.yml:/etc/traefik/dynamic.yml:ro