fix: remove host port mapping from ae_app service

With scale > 1, multiple replicas cannot bind to the same host port.
ae_app does not need a host port -- nginx routes to it internally via
the Docker service name 'ae_app:3000' with round-robin load balancing.
Removed ports: '${AE_APP_NODE_PORT}:3000' to fix the port conflict.

docker-compose.yml

@@ -146,8 +146,9 @@ services:
         scale: ${AE_APP_REPLICAS:-1}
         env_file:
             - ./.env
-        ports:
+        # No host port mapping — nginx routes to ae_app:3000 on the internal network.
-            - "${AE_APP_NODE_PORT}:3000"
+        # With scale > 1, all replicas share the same service name and Docker
+        # round-robins between them. A static host port would conflict.
         extra_hosts:
             srv-nyx.oneskyit.com: "104.237.143.4"
             dev-app.oneskyit.com: "104.237.143.4"