Align plugin monitor_port config

scripts/install.mjs

@@ -354,6 +354,7 @@ function summary() {
   log('Next steps:', 'blue');
   log(' 1. Register server in HarborForge Monitor to get apiKey', 'cyan');
   log(' 2. Edit ~/.openclaw/openclaw.json under plugins.entries.harbor-forge.config:', 'cyan');
+  log('    (prefer monitor_port; legacy monitorPort is still accepted)', 'cyan');
   log('    {', 'cyan');
   log('      "plugins": {', 'cyan');
   log('        "entries": {', 'cyan');