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

lib/uwb-types.ts

@@ -0,0 +1,67 @@
+// UWB Device Data Types (from ESP32 project context)
+
+export interface DeviceData {
+  deviceId: number;
+  distance: number;
+  rssi: number;
+  lastUpdate: number;
+  active: boolean;
+}
+
+export interface AnchorPosition {
+  anchorId: number;
+  x: number;
+  y: number;
+  confidence: number;
+  valid: boolean;
+}
+
+export interface RangeResult {
+  tagId: number;
+  mask: number;
+  sequence: number;
+  ranges: number[]; // 8 elements
+  rssi: number[];   // 8 elements
+  anchorIds: number[]; // 8 elements
+  timer: number;
+  timerSys: number;
+}
+
+export interface TagPosition {
+  x: number;
+  y: number;
+  timestamp: number;
+  confidence: number;
+}
+
+// Configuration constants from ESP32 project
+export const UWB_CONFIG = {
+  MAX_ANCHORS: 8,
+  UWB_TAG_COUNT: 64,
+  NETWORK_ID: 1234,
+  DEVICE_TIMEOUT: 5000,
+  BAUD_RATE: 115200,
+  DATA_RATE: 1, // 6.8Mbps
+  RANGE_FILTER: 1
+} as const;
+
+// Serial data parsing types
+export interface SerialData {
+  type: 'range' | 'config' | 'status';
+  raw: string;
+  parsed?: RangeResult | DeviceData[];
+  timestamp: number;
+}
+
+// File upload types for offline analysis
+export interface PositioningSession {
+  rawData: RangeResult[];
+  anchors: AnchorPosition[];
+  tagPath: TagPosition[];
+  sessionInfo: {
+    startTime: number;
+    endTime: number;
+    duration: number;
+    totalPoints: number;
+  };
+}