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/DataBuffer.test.ts

@@ -0,0 +1,89 @@
+import { describe, it, expect, beforeEach, vi } from 'vitest';
+import { DataBuffer } from '@/services/ble/DataBuffer';
+import type { NormalizedReading } from '@/services/ble/types';
+
+// Mock Taro Storage
+const storage = new Map<string, string>();
+vi.mock('@tarojs/taro', () => ({
+  default: {
+    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); }),
+    getStorageInfoSync: vi.fn(() => ({ keys: Array.from(storage.keys()), limitSize: 10240, currentSize: storage.size })),
+  },
+}));
+
+function makeReading(overrides: Partial<NormalizedReading> = {}): NormalizedReading {
+  return {
+    device_type: 'heart_rate',
+    values: { heart_rate: 72 },
+    measured_at: new Date().toISOString(),
+    ...overrides,
+  };
+}
+
+describe('DataBuffer', () => {
+  let buffer: DataBuffer;
+
+  beforeEach(() => {
+    storage.clear();
+    buffer = new DataBuffer({ bucketSize: 100 });
+  });
+
+  it('push 添加读数并持久化', () => {
+    const reading = makeReading();
+    buffer.push(reading);
+    expect(buffer.size()).toBe(1);
+  });
+
+  it('push 批量添加读数', () => {
+    const readings = Array.from({ length: 10 }, (_, i) =>
+      makeReading({ measured_at: new Date(Date.now() + i * 1000).toISOString() }),
+    );
+    buffer.push(readings);
+    expect(buffer.size()).toBe(10);
+  });
+
+  it('flush 返回并清空缓冲区', () => {
+    buffer.push([
+      makeReading({ measured_at: '2026-05-04T10:00:00.000Z' }),
+      makeReading({ measured_at: '2026-05-04T10:00:01.000Z' }),
+    ]);
+    const flushed = buffer.flush();
+    expect(flushed.length).toBe(2);
+    expect(buffer.size()).toBe(0);
+  });
+
+  it('超过 maxTotal 时丢弃最旧数据', () => {
+    const smallBuffer = new DataBuffer({ bucketSize: 5, maxTotal: 10 });
+    for (let i = 0; i < 15; i++) {
+      smallBuffer.push(makeReading({ measured_at: new Date(i * 1000).toISOString() }));
+    }
+    expect(smallBuffer.size()).toBe(10);
+  });
+
+  it('去重：相同 measured_at + device_type 不重复存储', () => {
+    const ts = '2026-05-04T10:00:00.000Z';
+    buffer.push(makeReading({ measured_at: ts }));
+    buffer.push(makeReading({ measured_at: ts }));
+    expect(buffer.size()).toBe(1);
+  });
+
+  it('restore 从 Storage 恢复未上传数据', () => {
+    buffer.push([
+      makeReading({ measured_at: '2026-05-04T10:00:00.000Z' }),
+      makeReading({ measured_at: '2026-05-04T10:00:01.000Z' }),
+    ]);
+    // 模拟重启：新建 DataBuffer 并 restore
+    const restored = new DataBuffer({ bucketSize: 100 });
+    const count = restored.restore();
+    expect(count).toBe(2);
+    expect(restored.size()).toBe(2);
+  });
+
+  it('clear 清空缓冲区和 Storage', () => {
+    buffer.push(makeReading());
+    buffer.clear();
+    expect(buffer.size()).toBe(0);
+  });
+});