Web UI default port 8888; Lock now in the power menu

New installs put the Web UI on port 8888 instead of 8090 (existing installs
keep their port; change it under Addons -> Web UI, which now also closes the
old port in the firewall). The power menu gets a Lock now button, shown only
when password protection is on.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013wi3ZQveYdjfcrEsyazq32

webui/server.js

@@ -294,7 +294,7 @@ app.put('/api/region', (req, res) => {
     runRegionHelper('region-set', input, res);
 });
 
-const PORT = process.env.PORT || 8090;
+const PORT = process.env.PORT || 8888;
 const BIND_ADDR = process.env.BIND_ADDR || '0.0.0.0';
 
 if (require.main === module) {