Update ICE servers to use metered.ca TURN

Switched to single metered.ca TURN server on port 443.

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

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

src/App.jsx

@@ -9,10 +9,10 @@ const RTC_CONFIG = {
     { urls: 'stun:stun.l.google.com:19302' },
     { urls: 'stun:stun1.l.google.com:19302' },
     {
-      urls: 'turn:relay1.expressturn.com:3480',
-      username: 'ef13B1E5PH265HK1N2',
-      credential: 'TTcTPEy3ndxsS0Gp'
-    }
+      urls: "turn:standard.relay.metered.ca:443",
+      username: "e03a51621b4f11ffbed3addd",
+      credential: "QPjJzPau1Ng5S0dq",
+    },
   ]
 };