fix: use port range for ae_app to support scaling with host port binding

Replace single AE_APP_NODE_PORT with AE_APP_NODE_PORT_RANGE (e.g. 3001-3006).
Docker assigns one port from the range to each replica, enabling external
nginx upstreams to reference individual ports per instance.

ae_api needs no host ports -- it scales via Docker DNS through ae_web_dev.

docker-compose.yml

@@ -146,7 +146,11 @@ services:
         env_file:
             - ./.env
         ports:
-            - "${AE_APP_NODE_PORT}:3000"
+            # Port range allows scaling: Docker assigns one host port per replica.
+            # e.g. AE_APP_NODE_PORT_RANGE=3001-3006 with AE_APP_REPLICAS=3 binds
+            # 3001→replica-1, 3002→replica-2, 3003→replica-3.
+            # Add matching ports to the external nginx upstream to enable them.
+            - "${AE_APP_NODE_PORT_RANGE:-3001-3001}:3000"
         extra_hosts:
             srv-nyx.oneskyit.com: "104.237.143.4"
             dev-app.oneskyit.com: "104.237.143.4"