Refactor: Remove background task management and related hooks

- Deleted `useBackgroundTasks.ts` hook and its associated logic for managing background tasks.
- Removed `backgroundTaskManager.ts` service and all related task definitions and registrations.
- Cleaned up `Podfile.lock` and `package.json` to remove unused dependencies related to background tasks.
- Updated iOS project files to eliminate references to removed background task components.
- Added new background fetch identifier in `Info.plist` for future use.

components/NutritionRecordCard.tsx

@@ -3,10 +3,12 @@ import { useThemeColor } from '@/hooks/useThemeColor';
 import { DietRecord } from '@/services/dietRecords';
 import { Ionicons } from '@expo/vector-icons';
 import dayjs from 'dayjs';
+import { Image } from 'expo-image';
 import React, { useMemo, useRef, useState } from 'react';
-import { Alert, Image, StyleSheet, Text, TouchableOpacity, View } from 'react-native';
+import { Alert, StyleSheet, Text, TouchableOpacity, View } from 'react-native';
 import { RectButton, Swipeable } from 'react-native-gesture-handler';
 
+
 export type NutritionRecordCardProps = {
   record: DietRecord;
   onPress?: () => void;
@@ -162,7 +164,11 @@ export function NutritionRecordCard({
             {/* 左侧：食物图片 */}
             <View style={[styles.foodImageContainer, !record.imageUrl && styles.foodImagePlaceholder]}>
               {record.imageUrl ? (
-                <Image source={{ uri: record.imageUrl }} style={styles.foodImage} />
+                <Image
+                  source={{ uri: record.imageUrl }}
+                  style={styles.foodImage}
+                  cachePolicy={'memory-disk'}
+                />
               ) : (
                 <Ionicons name="restaurant" size={28} color={textSecondaryColor} />
               )}