Bind staging Docker to 18088 so portproxy can own 8088.

infrastructure/docker-compose.registry.yml

@@ -91,8 +91,9 @@ services:
       frontend:
         condition: service_healthy
     ports:
-      # Localhost only — Docker Desktop on Windows often breaks 0.0.0.0; use netsh portproxy for LAN/public (see STAGING-DEPLOY.md).
-      - "127.0.0.1:${STAGING_HTTP_PORT:-8088}:80"
+      # Bind a private localhost port — Windows portproxy already owns public 8088.
+      # See STAGING-DEPLOY.md §7: portproxy 0.0.0.0:8088 → 127.0.0.1:18088
+      - "127.0.0.1:${STAGING_LOCAL_PORT:-18088}:80"
     volumes:
       - ./nginx/http-only.conf:/etc/nginx/conf.d/default.conf:ro
       - ./logs/nginx-staging:/var/log/nginx