fix: preserve container startup diagnostics

ecosystem.config.js

@@ -11,7 +11,9 @@ module.exports = {
       source_map_support: true,
       time: !isContainer,
       out_file: isContainer ? '/dev/null' : undefined,
-      error_file: isContainer ? '/dev/null' : undefined,
+      // Do not persist PM2 logs in containers, but keep early startup errors
+      // visible through `docker logs` before Winston is initialized.
+      error_file: isContainer ? '/proc/1/fd/2' : undefined,
       script: 'static/build/app.js',
       env: {
         http_proxy: '',