feat(approve): add skeleton loading and pagination to approval list

- Add skeleton card component with loading animation for initial page load
- Implement independent pagination for pending and done tabs with page tracking
- Add loadMore functionality with infinite scroll on page bottom reach
- Integrate u-loadmore component to display pagination status
- Refactor list rendering with conditional skeleton display and template wrapper
- Add skeleton-card styling with consistent card appearance and shadow
- Update getData method to support paginated API requests with page and limit parameters
- Add resetAndLoad method to reset pagination when switching tabs
- Improve UX by showing loading state during initial data fetch

assets/css/approve/index.scss

@@ -33,6 +33,14 @@
 
   .list-wrap {
     padding: 0 28rpx;
+
+    .skeleton-card {
+      background: #ffffff;
+      border-radius: 16rpx;
+      margin-bottom: 24rpx;
+      padding: 28rpx;
+      box-shadow: 0 4rpx 16rpx rgba(0, 0, 0, 0.05);
+    }
   }
 
   .approve-card {