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.

app.json

@@ -18,7 +18,8 @@
         "NSPhotoLibraryUsageDescription": "应用需要访问相册以选择您的体态照片用于AI测评。",
         "NSPhotoLibraryAddUsageDescription": "应用需要写入相册以保存拍摄的体态照片（可选）。",
         "UIBackgroundModes": [
-          "processing"
+          "background-fetch",
+          "background-processing"
         ]
       }
     },
@@ -69,7 +70,12 @@
           ]
         }
       ],
-      "expo-background-task"
+      [
+        "expo-background-fetch",
+        {
+          "minimumInterval": 15
+        }
+      ]
     ],
     "experiments": {
       "typedRoutes": true