fix: rename management center containers to {realm}[-test] convention

- docker/vmis: container_name vmis-backend → vmis
- docker/vmis-test: container_name vmis-backend-test → vmis-admin-test
- route YAML: vmis_backend_url uses realm dynamically (http://{realm}:10281)

All containers now follow consistent naming: nc-{realm}, oo-{realm}, {realm}

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

docker/vmis-test/docker-compose.yml

@@ -1,7 +1,7 @@
 services:
-  vmis-backend-test:
+  vmis-admin-test:
     image: vmis-backend:latest
-    container_name: vmis-backend-test
+    container_name: vmis-admin-test
     restart: unless-stopped
     env_file: .env
     volumes: