feat(miniprogram): BLE 增强层 — DataBuffer + GenericBleAdapter + DataSyncScheduler

- DataBuffer: 离线持久化缓冲（分桶存储 + 去重 + 容量管理）
- GenericBleAdapter: 基于 Bluetooth SIG 标准 Health Profile 的通用适配器
  (Heart Rate 0x180D / Health Thermometer 0x1809 / Blood Pressure 0x1810)
- DataSyncScheduler: 定时自动同步调度（基于时间间隔判断是否需要同步）
- BLEManager: 集成 DataBuffer 替换简单 Storage 缓存
- device-sync 页面: 注册 CustomBandAdapter + 自动同步 + 状态显示
- 新增 vitest 单元测试配置，30 个测试全部通过

apps/miniprogram/__tests__/services/ble/BLEManager.test.ts

@@ -0,0 +1,69 @@
+import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest';
+
+// 使用 vi.hoisted 确保 storage 在 mock 提升前可用
+const { storage } = vi.hoisted(() => ({
+  storage: new Map<string, string>(),
+}));
+
+vi.mock('@tarojs/taro', () => ({
+  default: {
+    openBluetoothAdapter: vi.fn().mockResolvedValue({}),
+    closeBluetoothAdapter: vi.fn().mockResolvedValue({}),
+    startBluetoothDevicesDiscovery: vi.fn().mockResolvedValue({}),
+    stopBluetoothDevicesDiscovery: vi.fn().mockResolvedValue({}),
+    onBluetoothDeviceFound: vi.fn(),
+    offBluetoothDeviceFound: vi.fn(),
+    createBLEConnection: vi.fn().mockResolvedValue({}),
+    closeBLEConnection: vi.fn().mockResolvedValue({}),
+    getBLEDeviceServices: vi.fn().mockResolvedValue({ services: [] }),
+    getBLEDeviceCharacteristics: vi.fn().mockResolvedValue({ characteristics: [] }),
+    notifyBLECharacteristicValueChange: vi.fn().mockResolvedValue({}),
+    onBLECharacteristicValueChange: vi.fn(),
+    onBLEConnectionStateChange: vi.fn(),
+    getStorageSync: vi.fn((key: string) => storage.get(key) || ''),
+    setStorageSync: vi.fn((key: string, value: string) => { storage.set(key, value); }),
+    removeStorageSync: vi.fn((key: string) => { storage.delete(key); }),
+  },
+}));
+
+import { BLEManager } from '@/services/ble/BLEManager';
+import { XiaomiBandAdapter } from '@/services/ble/adapters/XiaomiBandAdapter';
+
+describe('BLEManager DataBuffer 集成', () => {
+  let manager: BLEManager;
+
+  beforeEach(() => {
+    storage.clear();
+    manager = new BLEManager();
+    manager.registerAdapter(XiaomiBandAdapter);
+  });
+
+  afterEach(async () => {
+    await manager.destroy();
+  });
+
+  it('registerAdapter 添加适配器', () => {
+    const count = (manager as any).adapters.length;
+    expect(count).toBeGreaterThanOrEqual(1);
+  });
+
+  it('getCachedReadings 返回空数组（未连接时）', () => {
+    const readings = manager.getCachedReadings();
+    expect(readings).toEqual([]);
+  });
+
+  it('flushPendingReadings 无缓存时返回 0', async () => {
+    const uploadFn = vi.fn().mockResolvedValue(0);
+    const count = await manager.flushPendingReadings(uploadFn);
+    expect(count).toBe(0);
+    expect(uploadFn).not.toHaveBeenCalled();
+  });
+
+  it('DataBuffer 实例已初始化', () => {
+    const buffer = (manager as any).dataBuffer;
+    expect(buffer).toBeDefined();
+    expect(typeof buffer.push).toBe('function');
+    expect(typeof buffer.flush).toBe('function');
+    expect(typeof buffer.restore).toBe('function');
+  });
+});