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/vitest.config.ts

@@ -0,0 +1,15 @@
+import { defineConfig } from 'vitest/config';
+import path from 'path';
+
+export default defineConfig({
+  test: {
+    environment: 'node',
+    include: ['__tests__/**/*.test.ts'],
+    globals: true,
+  },
+  resolve: {
+    alias: {
+      '@': path.resolve(__dirname, 'src'),
+    },
+  },
+});