Fix datachannel name to match service pool

Changed channel name from 'chat' to 'rondevu-service' to match the
channel name created by the service pool. This fixes the connection
failure where the offerer's channel and answerer's channel had
different names and couldn't connect.

The service pool creates a channel named 'rondevu-service', so clients
must use the same name to receive that channel.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/App.jsx

@@ -337,8 +337,8 @@ export default function App() {
         maxReconnectAttempts: 5
       });
 
-      // Create data channel
-      const channel = connection.createChannel('chat');
+      // Create data channel (must match service pool's channel name)
+      const channel = connection.createChannel('rondevu-service');
 
       // Listen for connection events
       connection.on('connected', () => {