docs: note TypeScript migration

chat-ui/src/server.ts

@@ -0,0 +1,27 @@
+import express, { Request, Response } from 'express';
+import axios from 'axios';
+import bodyParser from 'body-parser';
+import path from 'path';
+
+const app = express();
+const port = Number(process.env.PORT) || 3000;
+const agentUrl = process.env.LLM_AGENT_URL as string | undefined;
+
+app.use(bodyParser.json());
+app.use(express.static(path.join(__dirname, 'public')));
+
+app.post('/send', async (req: Request, res: Response) => {
+  if (!agentUrl) {
+    return res.status(500).json({ error: 'LLM_AGENT_URL not configured' });
+  }
+  try {
+    const { message } = req.body;
+    const response = await axios.post(agentUrl, { message });
+    res.json(response.data);
+  } catch (err: any) {
+    console.error('Failed to forward message', err.message);
+    res.status(500).json({ error: 'Failed to communicate with agent' });
+  }
+});
+
+app.listen(port, () => console.log(`Chat UI listening on port ${port}`));