Refactor components and enhance background task management

- Updated font sizes and weights in BasalMetabolismCard, MoodCard, HealthDataCard, and NutritionRadarCard for improved readability.
- Removed loading state from MoodCard to simplify the component.
- Adjusted styles in WeightHistoryCard for better layout and spacing.
- Integrated expo-background-fetch for improved background task handling.
- Updated Info.plist to include background fetch capability.
- Enhanced background task registration and execution logic in backgroundTaskManager.
- Added debug function to manually trigger background task execution for testing purposes.

components/statistic/HealthDataCard.tsx

@@ -61,12 +61,12 @@ const styles = StyleSheet.create({
     alignItems: 'flex-end',
   },
   value: {
-    fontSize: 20,
+    fontSize: 16,
     fontWeight: '600',
     color: '#192126',
   },
   unit: {
-    fontSize: 14,
+    fontSize: 12,
     color: '#666',
     marginLeft: 4,
     marginBottom: 2,