refactor(health): remove HRV field and improve notification types

- Remove heart rate variability (hrv) field from health data interfaces and implementations
- Update default member name to Chinese localization
- Replace type assertions with proper enum types in notification schedulers

app/(tabs)/statistics.tsx

@@ -229,7 +229,6 @@ export default function ExploreScreen() {
           date: dateString,
           data: {
             activeCalories: data.activeEnergyBurned,
-            hrv: data.hrv,
             heartRate: data.heartRate,
             activeEnergyBurned: data.activeEnergyBurned,
             activeCaloriesGoal: data.activeCaloriesGoal,