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

README.md

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+# UWB Positioning Web Application
+
+Next.js web application for visualizing and analyzing UWB indoor positioning data.
+
+## Features
+
+- **Real-time Positioning**: Live visualization of tag positions via WebSocket
+- **Data Analysis**: Upload and analyze positioning session files
+- **Interactive Maps**: 2D warehouse visualization with anchor positions
+- **Path Tracking**: Tag movement analysis and playback
+
+## Quick Start
+
+```bash
+npm install
+npm run dev
+```
+
+## Project Structure
+
+```
+uwb-webapp/
+├── app/                 # Next.js App Router pages
+├── components/          # React components
+├── lib/                # Utilities and configurations  
+├── pages/api/          # API routes
+├── public/             # Static assets
+└── utils/              # Helper functions
+```
+
+## Context from ESP32 Project
+
+This webapp connects to the ESP32-S3 UWB positioning system:
+
+- **Hardware**: Makerfabs MaUWB modules (ESP32-S3 + DW3000 UWB + OLED)
+- **Network**: 8 anchors + 1 mobile tag (ID 1234, 6.8Mbps)
+- **Data Flow**: Tag → USB → PC → WebApp
+- **Files**: raw_positioning.csv + anchor_coordinates.csv
+
+## API Endpoints
+
+- `GET /api/serial` - List available serial ports
+- `POST /api/connect` - Connect to UWB device
+- `GET /api/data` - Get positioning data stream
+- `POST /api/upload` - Upload CSV files for analysis
+
+## Tech Stack
+
+- **Framework**: Next.js 14 with App Router
+- **Language**: TypeScript
+- **Serial**: Node SerialPort for ESP32 communication
+- **WebSocket**: Real-time data streaming
+- **Visualization**: Canvas/SVG for 2D positioning display