refactor(item): 移除商品预览页面面包屑导航中的多余元素

- 删除了面包屑导航中的箭头图标
- 移除了分类名称链接的重复结构
- 简化了面包屑导航的HTML结构
- 清理了相关的点击事件处理器代码
- 优化了面包屑导航的样式布局
- 提升了页面渲染性能

src/views/item/preview.vue

@@ -3,12 +3,6 @@
     <!-- 面包屑 -->
     <div class="breadcrumb-bos">
       <div class="home" @click="onPath('/index')">首页</div>
-      <el-icon style="margin: 2px 4px 0 4px" size="14"><ArrowRight /></el-icon>
-      <div class="home" @click="onPath('/search?type=1&topCategoryId=' + dataInfo.topCategoryId)">{{ dataInfo.topCategoryName }}</div>
-      <el-icon style="margin: 2px 4px 0 4px" size="14"><ArrowRight /></el-icon>
-      <div class="home" @click="onPath('/search?type=2&mediumCategoryId=' + dataInfo.mediumCategoryId)">{{ dataInfo.mediumCategoryName }}</div>
-      <el-icon style="margin: 2px 4px 0 4px" size="14"><ArrowRight /></el-icon>
-      <div class="home" @click="onPath('/search?type=3&bottomCategoryId=' + dataInfo.bottomCategoryId)">{{ dataInfo.bottomCategoryName }}</div>
     </div>
     <div class="shop-bos">
       <div class="shop-left">