feat: 为搜索页栏目添加图片缩略图功能

- 图片预览：产品与解决方案栏目添加缩略图功能
- 组件提取：在搜索结果页，将单个搜索结果单独提取为组件SearchResultCard

app/components/pages/search/SearchResults.vue

@@ -6,16 +6,7 @@
         :key="`${hit.type}-${hit.id}`"
         :to="localePath(resolveHitLink(hit))"
       >
-        <el-card class="result-card">
-          <h3 class="result-title">{{ hit.title }}</h3>
-          <p v-if="hit.summary" class="result-summary">
-            {{ hit.summary }}
-          </p>
-          <p v-if="hit.type" class="result-type">
-            <span>{{ $t('search.section') }}: </span>
-            <span class="result-type-name">{{ getIndexLabel(hit.type) }}</span>
-          </p>
-        </el-card>
+        <search-result-card :item="hit" :type-label="getIndexLabel(hit.type)" />
       </NuxtLink>
     </div>