feat(demo-vue): 全站 i18n 抽文案、中英文资源与页面接入

- 引入 vue-i18n，集中维护 zh-CN / en-US 文案与产品 catalog、长文 HTML
- 前台与后台列表/弹窗/校验/删除确认等改为 t()，顶栏与新闻/行业列表与详情页多语言
- 修正 Industry 等页面文首误粘贴；请求头 Accept-Language 与 Element 语言随 locale 切换

demo-vue/src/views/industry/IndustryPage.vue

@@ -1,5 +1,3 @@
-NEW_FILE_CODE
-
 <template>
   <div class="industry-page">
     <HeaderComponent />
@@ -8,17 +6,17 @@ NEW_FILE_CODE
       <section class="industry-banner">
         <div class="banner-overlay">
           <div class="banner-wrapper">
-            <h1 class="banner-title">行业动态</h1>
-            <p class="banner-subtitle">Industry News</p>
+            <h1 class="banner-title">{{ t('industry.listBanner') }}</h1>
+            <p class="banner-subtitle">{{ t('industry.listBannerSub') }}</p>
           </div>
         </div>
       </section>
 
       <section class="breadcrumb-section">
         <div class="breadcrumb-wrapper">
-          <span class="breadcrumb-item">首页</span>
+          <span class="breadcrumb-item">{{ t('nav.home') }}</span>
           <span class="breadcrumb-separator">/</span>
-          <span class="breadcrumb-item active">行业动态</span>
+          <span class="breadcrumb-item active">{{ t('nav.industryNews') }}</span>
         </div>
       </section>
 
@@ -30,7 +28,7 @@ NEW_FILE_CODE
               <div class="industry-meta">
                 <span class="meta-item">
                   <el-icon><View /></el-icon>
-                  访问量：{{ item.views }}
+                  {{ t('common.viewsLabel') }}{{ item.views }}
                 </span>
               </div>
             </div>
@@ -49,10 +47,10 @@ NEW_FILE_CODE
               <button class="page-btn" :disabled="currentPage === totalPages" @click="nextPage">
                 <el-icon><ArrowRight /></el-icon>
               </button>
-              <span class="jump-text">跳往</span>
+              <span class="jump-text">{{ t('common.goTo') }}</span>
               <input type="number" class="page-input" v-model.number="jumpPage" @keyup.enter="jumpToPage" min="1" :max="totalPages" />
-              <span class="jump-text">前往</span>
-              <span class="page-info">页</span>
+              <span class="jump-text">{{ t('common.toPage') }}</span>
+              <span class="page-info">{{ t('common.pageUnit') }}</span>
             </div>
           </div>
         </div>
@@ -66,12 +64,14 @@ NEW_FILE_CODE
 <script setup lang="ts">
 import { ref, onMounted } from 'vue'
 import { useRouter } from 'vue-router'
+import { useI18n } from 'vue-i18n'
 import { View, ArrowLeft, ArrowRight } from '@element-plus/icons-vue'
 import HeaderComponent from '@/components/HeaderComponent.vue'
 import FooterComponent from '@/components/FooterComponent.vue'
 import { post } from '@/utils/request'
 
 const router = useRouter()
+const { t } = useI18n()
 
 // 行业动态列表数据
 const industryList = ref<any[]>([])
@@ -124,7 +124,7 @@ const getIndustryList = async (page: number = 1) => {
     // 设置总页数
     totalPages.value = Math.ceil(response.data.total / pageSize)
   } catch (error: any) {
-    console.error('获取行业动态列表失败:', error)
+    console.error(t('industry.fetchFail'), error)
     industryList.value = []
   }
 }