feat(miniprogram): BLE 设备同步模块 — 扫描+连接+数据上传

- Task 18: BLE 类型定义（NormalizedReading/DeviceAdapter/BLEDevice）+ BLEManager 连接管理器
- Task 19: XiaomiBandAdapter 心率读取适配器（标准 HRS Service 0x180D）
- Task 20: device-sync API 层 + 设备同步页面 + app.config 路由注册

apps/miniprogram/src/services/ble/adapters/XiaomiBandAdapter.ts

@@ -0,0 +1,83 @@
+import type { DeviceAdapter, NormalizedReading } from '../types';
+
+/**
+ * 小米手环 BLE 适配器
+ *
+ * 支持 Mi Band 7/8 等型号，使用标准 Heart Rate Service 读取心率数据。
+ * 未来可扩展步数（0xFEE1）、睡眠等 Mi Band 专有 Service。
+ */
+
+// 标准 BLE Heart Rate Service
+const HRS_SERVICE = '0000180D-0000-1000-8000-00805F9B34FB';
+const HRM_CHARACTERISTIC = '00002A37-0000-1000-8000-00805F9B34FB';
+
+// 小米 Mi Band 专有 Service（步数/活动量）
+// const MI_BAND_SERVICE = '0000FEE1-0000-1000-8000-8000-00805F9B34FB';
+
+/** 解析心率测量值（Heart Rate Measurement 格式） */
+function parseHeartRate(data: ArrayBuffer): number | null {
+  const view = new DataView(data);
+  if (view.byteLength < 2) return null;
+
+  const flags = view.getUint8(0);
+  // Bit 0: Heart Rate Format — 0 = UINT8, 1 = UINT16
+  const isUINT16 = (flags & 0x01) !== 0;
+
+  if (isUINT16) {
+    if (view.byteLength < 3) return null;
+    return view.getUint16(1, true); // little-endian
+  }
+  return view.getUint8(1);
+}
+
+export const XiaomiBandAdapter: DeviceAdapter = {
+  name: 'Xiaomi Band',
+
+  supportedModels: [
+    'Mi Band',
+    'Mi Smart Band',
+    'Xiaomi Band',
+    'Xiaomi Smart Band',
+    'MI BAND',
+    'MiBand',
+  ],
+
+  serviceUUIDs: [HRS_SERVICE],
+
+  notifyCharacteristics: [
+    { service: HRS_SERVICE, characteristic: HRM_CHARACTERISTIC },
+  ],
+
+  readCharacteristics: [
+    { service: HRS_SERVICE, characteristic: HRM_CHARACTERISTIC },
+  ],
+
+  parseNotification(
+    _serviceUUID: string,
+    charUUID: string,
+    data: ArrayBuffer,
+  ): NormalizedReading | null {
+    if (charUUID.toUpperCase().includes('2A37')) {
+      const hr = parseHeartRate(data);
+      if (hr !== null && hr > 0 && hr < 300) {
+        return {
+          device_type: 'heart_rate',
+          values: { heart_rate: hr },
+          measured_at: new Date().toISOString(),
+        };
+      }
+    }
+    return null;
+  },
+
+  parseReadResponse(
+    _serviceUUID: string,
+    _charUUID: string,
+    _data: ArrayBuffer,
+  ): NormalizedReading | null {
+    // 读取模式暂不支持，使用通知模式获取数据
+    return null;
+  },
+};
+
+export default XiaomiBandAdapter;