chore: wire launcher to engine internal network

infra/synology/docker-compose.platform-http.yml

@@ -25,6 +25,7 @@ services:
     networks:
       - edge
       - identity
+      - engine
 
   launcher:
     image: nodedc/launcher:local
@@ -125,6 +126,9 @@ services:
 
 networks:
   edge:
+  engine:
+    external: true
+    name: ${NODEDC_ENGINE_DOCKER_NETWORK:-nodedc-demo_default}
   identity:
     internal: true