feat: implement single-port UART

uart_example/vite.config.js

@@ -0,0 +1,9 @@
+import { defineConfig } from 'vite';
+
+export default defineConfig({
+  server: {
+    port: 3000,
+    open: false, // Don't auto open browser in command-line environments to avoid errors
+  },
+  base: './',
+});