Use unique backend alias for assistant

docker-compose.prod.yml

@@ -37,7 +37,11 @@ services:
     expose:
       - "8000"
     networks:
-      - wealthysmart-network
+      wealthysmart-network:
+        # Avoid the generic `backend` name, which is also used on the shared
+        # nginx network by another application.
+        aliases:
+          - wealthysmart-api
     depends_on:
       db:
         condition: service_healthy
@@ -59,9 +63,8 @@ services:
     restart: unless-stopped
     environment:
       NODE_ENV: production
-      # Compose service names are the stable DNS names on this network.
-      BACKEND_URL: http://backend:8000
-      AGENT_URL: http://backend:8000/api/v1/agent/agui
+      BACKEND_URL: http://wealthysmart-api:8000
+      AGENT_URL: http://wealthysmart-api:8000/api/v1/agent/agui
       JWT_SECRET: ${SECRET_KEY}
       COOKIE_DOMAIN: wealth.cescalante.dev
       COOKIE_SECURE: "true"