feat(demo-vue): 新闻页面与行业动态页面新增多语言支持

- 升级组件与页面，支持根据语言环境（中/英）条件渲染标题与内容
- 在 IndustryNews 和 News 实体类中新增英文标题、英文内容字段
- sql导出demo_news_full_dump_utf8mb4_2026-04-28.sql

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

@@ -25,7 +25,7 @@
       <section class="detail-section" v-loading="loading">
         <div class="detail-wrapper">
           <article class="article-content">
-            <h1 class="article-title">{{ industryDetail.title }}</h1>
+            <h1 class="article-title">{{ locale === 'en-US' && industryDetail.titleEn ? industryDetail.titleEn : industryDetail.title }}</h1>
             <div class="article-meta">
               <span class="meta-item">
                 <el-icon><Calendar /></el-icon>
@@ -36,7 +36,7 @@
                 {{ t('common.viewsLabel') }}{{ industryDetail.views }}
               </span>
             </div>
-            <div class="article-body" v-html="industryDetail.content"></div>
+            <div class="article-body" v-html="locale === 'en-US' && industryDetail.contentEn ? industryDetail.contentEn : industryDetail.content"></div>
           </article>
 
           <div class="back-button">
@@ -65,7 +65,7 @@ import { industryApi } from '@/api/industry-api.ts'
 
 const router = useRouter()
 const route = useRoute()
-const { t } = useI18n()
+const { t, locale } = useI18n()
 
 // 行业动态详情数据
 const industryDetail = ref<any>({