[阶段2.1-2.2] 实现 Garmin 数据同步和健康数据查询路由

后端实现:
- 实现 garmin 路由
  - POST /api/garmin/sync 触发 Garmin 数据同步
  - GET /api/garmin/status 获取同步状态
- 实现 health 路由（所有端点都需要认证）
  - GET /api/health/summary 获取健康数据摘要
  - GET /api/health/steps 获取步数数据
  - GET /api/health/heart-rate 获取心率数据
  - GET /api/health/sleep 获取睡眠数据
  - GET /api/health/activities 获取运动数据

依赖:
- 安装 garmin-connect 用于 Garmin API 集成
- 所有健康数据查询都通过认证中间件保护

验收标准已满足:
- 所有路由返回正确的格式
- 认证检查已应用
- 日期范围过滤支持

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

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