feat: 集成健康数据功能

- 在项目中引入 react-native-health 库以获取健康数据
- 在 Explore 页面中添加步数和能量消耗的显示
- 实现页面聚焦时自动拉取今日健康数据
- 更新 iOS 权限设置以支持健康数据访问
- 添加健康数据相关的工具函数以简化数据获取

package.json

@@ -33,6 +33,7 @@
     "react-dom": "19.0.0",
     "react-native": "0.79.5",
     "react-native-gesture-handler": "~2.24.0",
+    "react-native-health": "^1.19.0",
     "react-native-reanimated": "~3.17.4",
     "react-native-safe-area-context": "5.4.0",
     "react-native-screens": "~4.11.1",