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

pages/api/serial/ports.ts

@@ -0,0 +1,37 @@
+import { NextApiRequest, NextApiResponse } from 'next'
+import { SerialPort } from 'serialport'
+
+export default async function handler(
+  req: NextApiRequest,
+  res: NextApiResponse
+) {
+  if (req.method !== 'GET') {
+    return res.status(405).json({ message: 'Method not allowed' })
+  }
+
+  try {
+    const ports = await SerialPort.list()
+    
+    // Filter for ESP32 devices (common VID/PID patterns)
+    const esp32Ports = ports.filter(port => 
+      port.vendorId === '10C4' || // Silicon Labs CP210x
+      port.vendorId === '1A86' || // QinHeng Electronics CH340
+      port.vendorId === '0403' ||  // FTDI
+      port.manufacturer?.includes('Silicon Labs') ||
+      port.manufacturer?.includes('FTDI') ||
+      port.productId === 'EA60'    // CP2102
+    )
+
+    res.status(200).json({
+      allPorts: ports,
+      esp32Ports,
+      count: esp32Ports.length
+    })
+  } catch (error) {
+    console.error('Error listing serial ports:', error)
+    res.status(500).json({ 
+      message: 'Failed to list serial ports',
+      error: error instanceof Error ? error.message : 'Unknown error'
+    })
+  }
+}