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/TemplatePanel/index.vue

@@ -1,7 +1,7 @@
 <template>
   <Card class="template-panel">
     <view class="panel-header">
-      <Typography variant="h4" weight="semibold">搜索模板</Typography>
+      <Typography variant="h4" weight="semibold">{{ $t('search.searchTemplates') }}</Typography>
       <Button size="small" type="text" @click="handleRefresh">
         <Icon name="refresh" size="16rpx" color="rgba(113, 113, 122, 255)" />
       </Button>
@@ -12,7 +12,7 @@
         <Icon name="search" size="16rpx" color="rgba(113, 113, 122, 255)" />
         <input
           v-model="searchKeyword"
-          placeholder="搜索模板"
+          :placeholder="$t('search.searchTemplates')"
           class="input-field"
         />
       </view>
@@ -33,8 +33,8 @@
     <view v-if="filteredTemplates.length === 0" class="empty-templates">
       <EmptyState
         icon="empty"
-        title="暂无模板"
-        description="没有找到符合条件的模板"
+        :title="$t('search.noTemplatesTitle')"
+        :description="$t('search.noTemplatesDesc')"
         size="small"
       />
     </view>
@@ -65,6 +65,7 @@
 
 <script setup lang="ts">
 import { ref, computed, onMounted } from 'vue'
+import { useI18n } from 'vue-i18n'
 import type { SearchRequest, SearchTemplate } from '../../types/search'
 import templateService from '../../services/templateService'
 import Card from '../Card/Card.vue'
@@ -73,23 +74,25 @@ import Icon from '../Icon/Icon.vue'
 import Typography from '../Typography/Typography.vue'
 import EmptyState from '../EmptyState/index.vue'
 
+const { t } = useI18n()
+
 const emit = defineEmits<{
   select: [condition: SearchRequest]
 }>()
 
 const searchKeyword = ref('')
-const selectedCategory = ref('全部')
+const selectedCategory = ref('__all__')
 const templates = ref<SearchTemplate[]>([])
 
 const categories = computed(() => {
   const allCategories = templateService.getCategories()
-  return ['全部', ...allCategories]
+  return [t('search.allCategories'), ...allCategories]
 })
 
 const filteredTemplates = computed(() => {
   let result = templates.value
 
-  if (selectedCategory.value !== '全部') {
+  if (selectedCategory.value !== '__all__') {
     result = templateService.getTemplatesByCategory(selectedCategory.value)
   }
 
@@ -105,7 +108,7 @@ onMounted(() => {
 })
 
 function loadTemplates() {
-  templates.value = templateService.getTemplates()
+  templates.value = templateService.getSearchTemplates()
 }
 
 function handleRefresh() {