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

server/utils/search-converters.ts

@@ -9,6 +9,7 @@ export const converters: {
     type: 'product',
     title: item.name,
     summary: item.summary,
+    thumbnail: `/api/assets/${item.cover}`,
   }),
 
   solutions: (item: MeiliIndexMap['solutions']): SearchItemView => ({
@@ -16,6 +17,7 @@ export const converters: {
     type: 'solution',
     title: item.title,
     summary: item.summary,
+    thumbnail: `/api/assets/${item.cover}`,
   }),
 
   questions: (item: MeiliIndexMap['questions']): SearchItemView => ({