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nginx.conf is now a template the nginx image renders into conf.d at container start. bin/entrypoint.sh sets PORT to 8080 when unset or empty, and stops with an error before starting anything when PORT is not digits only: nginx would take a value such as localhost or unix:/tmp/x.sock as an address and start anyway. NGINX_ENVSUBST_FILTER limits the rendering to PORT, so $uri, $host and every other nginx variable pass through unchanged. server_tokens off drops the version from the Server header and error pages. script/frontend-viewport-test renders the template the same way. EXPOSE still documents 8080; the backend stays on 127.0.0.1:8081. Model: opus-5-5