feat(i18n): 改造10个组件为i18n国际化，同步更新9种语言翻译文件

- 组件改造：EmptyState、ExportPanel、SearchConditionItem、SearchHistoryPanel、
  SearchResultCard、SearchResultList、Select、SortSwitcher、TemplatePanel、
  BottomNavigation、SearchConditionPanel
- 替换硬编码中文为 $t() 调用和 computed 响应式翻译
- 新增翻译键：search（搜索历史/模板/条件）、export（导出选项）、
  common.pleaseSelect 等
- 同步更新 zh-CN、en、zh-TW、ja、ko、es、fr、de、pt 共9种语言文件
- 重构 errorHandler：从 API 错误处理改为本地应用错误处理
- 移除 search.ts 中未使用的 SearchService 接口

everything-is-suitable-uniapp/src/components/SearchResultCard/index.vue

@@ -9,21 +9,22 @@
       <Typography variant="caption" class="lunar-date">{{ result.lunarDate }}</Typography>
 
       <view v-if="result.matchedItems.suitable.length > 0" class="matched-items">
-        <Typography variant="caption" class="label suitable-label">宜</Typography>
+        <Typography variant="caption" class="label suitable-label">{{ $t('search.suitable') }}</Typography>
         <Typography variant="body" class="items suitable-items">{{ result.matchedItems.suitable.join('、') }}</Typography>
       </view>
 
       <view v-if="result.matchedItems.unsuitable.length > 0" class="matched-items">
-        <Typography variant="caption" class="label unsuitable-label">忌</Typography>
+        <Typography variant="caption" class="label unsuitable-label">{{ $t('search.unsuitable') }}</Typography>
         <Typography variant="body" class="items unsuitable-items">{{ result.matchedItems.unsuitable.join('、') }}</Typography>
       </view>
 
-      <Typography variant="caption" class="match-count">匹配度: {{ result.matchCount }}</Typography>
+      <Typography variant="caption" class="match-count">{{ $t('search.matchCount') }}: {{ result.matchCount }}</Typography>
     </view>
   </Card>
 </template>
 
 <script setup lang="ts">
+import { useI18n } from 'vue-i18n'
 import type { SearchResult } from '../../types/search'
 import Card from '../Card/Card.vue'
 import Typography from '../Typography/Typography.vue'
@@ -34,12 +35,14 @@ interface Props {
 
 defineProps<Props>()
 
+const { t } = useI18n()
+
 const formatDate = (dateStr: string) => {
   const date = new Date(dateStr)
   const year = date.getFullYear()
   const month = String(date.getMonth() + 1).padStart(2, '0')
   const day = String(date.getDate()).padStart(2, '0')
-  return `${year}年${month}月${day}日`
+  return t('search.dateFormat', { year, month, day })
 }
 </script>