chat implemented

need testing

apps/mobile/.env.example

@@ -34,6 +34,11 @@ EXPO_PUBLIC_CLERK_PUBLISHABLE_KEY=pk_test_your_publishable_key_here
 #
 EXPO_PUBLIC_API_URL=http://localhost:3000
 
+# Optional realtime override (defaults to EXPO_PUBLIC_API_URL host)
+# Set this when your Socket.IO service runs on a different origin/port.
+EXPO_PUBLIC_REALTIME_URL=http://localhost:3001
+EXPO_PUBLIC_REALTIME_PATH=/socket.io
+
 # =============================================================================
 # App Configuration (Optional)
 # =============================================================================