Initial commit: Next.js UWB positioning webapp

- Complete Next.js 14 app with TypeScript and Tailwind CSS
- ESP32 serial communication via API routes
- Real-time UWB positioning visualization
- Interactive 2D warehouse mapping with Canvas
- Device connection interface with auto-detection
- AT command parsing for UWBHelper library integration
- Clean project structure with comprehensive documentation

next.config.js

@@ -0,0 +1,12 @@
+/** @type {import('next').NextConfig} */
+const nextConfig = {
+  webpack: (config) => {
+    // Handle serialport native bindings for server-side
+    config.externals.push({
+      'serialport': 'commonjs serialport'
+    });
+    return config;
+  }
+}
+
+module.exports = nextConfig