refactor: 移除未使用的Vant组件和冗余的默认值设置

清理未使用的Vant组件声明以减小打包体积
移除LearningRecordsPage中study_count和count的默认值设置，因其已在后端处理

@@ -29,38 +29,14 @@ declare module 'vue' {
     TermsPopup: typeof import('./components/ui/TermsPopup.vue')['default']
     UploadVideoPopup: typeof import('./components/ui/UploadVideoPopup.vue')['default']
     UserAgreement: typeof import('./components/ui/UserAgreement.vue')['default']
-    VanActionSheet: typeof import('vant/es')['ActionSheet']
     VanButton: typeof import('vant/es')['Button']
-    VanCalendar: typeof import('vant/es')['Calendar']
-    VanCellGroup: typeof import('vant/es')['CellGroup']
-    VanCheckbox: typeof import('vant/es')['Checkbox']
-    VanCol: typeof import('vant/es')['Col']
-    VanConfigProvider: typeof import('vant/es')['ConfigProvider']
-    VanDatePicker: typeof import('vant/es')['DatePicker']
-    VanDialog: typeof import('vant/es')['Dialog']
-    VanDivider: typeof import('vant/es')['Divider']
-    VanEmpty: typeof import('vant/es')['Empty']
     VanField: typeof import('vant/es')['Field']
-    VanForm: typeof import('vant/es')['Form']
     VanIcon: typeof import('vant/es')['Icon']
     VanImage: typeof import('vant/es')['Image']
-    VanImagePreview: typeof import('vant/es')['ImagePreview']
     VanList: typeof import('vant/es')['List']
-    VanLoading: typeof import('vant/es')['Loading']
-    VanNavBar: typeof import('vant/es')['NavBar']
-    VanOverlay: typeof import('vant/es')['Overlay']
-    VanPicker: typeof import('vant/es')['Picker']
-    VanPickerGroup: typeof import('vant/es')['PickerGroup']
     VanPopup: typeof import('vant/es')['Popup']
     VanProgress: typeof import('vant/es')['Progress']
     VanRate: typeof import('vant/es')['Rate']
-    VanRow: typeof import('vant/es')['Row']
-    VanSwipe: typeof import('vant/es')['Swipe']
-    VanSwipeItem: typeof import('vant/es')['SwipeItem']
-    VanTab: typeof import('vant/es')['Tab']
-    VanTabs: typeof import('vant/es')['Tabs']
-    VanTag: typeof import('vant/es')['Tag']
-    VanUploader: typeof import('vant/es')['Uploader']
     VideoPlayer: typeof import('./components/ui/VideoPlayer.vue')['default']
     WechatPayment: typeof import('./components/payment/WechatPayment.vue')['default']
   }

@@ -138,8 +138,6 @@ const onLoad = async () => {
   });
   if (code) {
     data.forEach((item) => {
-      item?.study_count = item?.study_count || 0;
-      item?.count = item?.count || 0;
       item.record_progress = Math.floor((item?.study_count/item?.count)*100);
     });
     records.value.push(...data);