feat(frontend): replace lazy loading with zibll lazysizes

assets/css/frontend/pages/base-3.css

@@ -26,21 +26,6 @@
   text-decoration: underline;
 }
 
-/* 分类推荐懒加载骨架 */
-.category-recommend-card__hero .aksrt-skeleton {
-  position: absolute;
-  inset: 0;
-}
-
-.category-recommend-card__hero img.aksrt-lazy {
-  opacity: 0;
-  transition: opacity 0.3s ease;
-}
-
-.category-recommend-card__hero img.aksrt-loaded {
-  opacity: 1;
-}
-
 /* 分类推荐响应式 */
 @media (max-width: 767px) {
   .category-recommend {
@@ -121,4 +106,3 @@
   line-height: var(--leading-relaxed, 1.7);
   color: var(--color-ink-3);
 }
-