Prepare backend for frontend integration

compose.yaml

@@ -60,7 +60,7 @@ services:
     volumes:
       - ./config:/app/config
     ports:
-      - "${HUB_PORT:-7777}:7777"
+      - "${BACKEND_BIND:-127.0.0.1:17777}:7777"
     depends_on:
       db-init:
         condition: service_completed_successfully