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/package-lock.json

@@ -15,6 +15,7 @@
         "less": "^4.5.1",
         "pinia": "^3.0.4",
         "vue": "^3.5.29",
+        "vue-i18n": "^9.14.4",
         "vue-router": "^5.0.3"
       },
       "devDependencies": {
@@ -971,6 +972,50 @@
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       "license": "MIT"
     },
+    "node_modules/@intlify/core-base": {
+      "version": "9.14.4",
+      "resolved": "https://registry.npmmirror.com/@intlify/core-base/-/core-base-9.14.4.tgz",
+      "integrity": "sha512-vtZCt7NqWhKEtHa3SD/322DlgP5uR9MqWxnE0y8Q0tjDs9H5Lxhss+b5wv8rmuXRoHKLESNgw9d+EN9ybBbj9g==",
+      "license": "MIT",
+      "dependencies": {
+        "@intlify/message-compiler": "9.14.4",
+        "@intlify/shared": "9.14.4"
+      },
+      "engines": {
+        "node": ">= 16"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/kazupon"
+      }
+    },
+    "node_modules/@intlify/message-compiler": {
+      "version": "9.14.4",
+      "resolved": "https://registry.npmmirror.com/@intlify/message-compiler/-/message-compiler-9.14.4.tgz",
+      "integrity": "sha512-vcyCLiVRN628U38c3PbahrhbbXrckrM9zpy0KZVlDk2Z0OnGwv8uQNNXP3twwGtfLsCf4gu3ci6FMIZnPaqZsw==",
+      "license": "MIT",
+      "dependencies": {
+        "@intlify/shared": "9.14.4",
+        "source-map-js": "^1.0.2"
+      },
+      "engines": {
+        "node": ">= 16"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/kazupon"
+      }
+    },
+    "node_modules/@intlify/shared": {
+      "version": "9.14.4",
+      "resolved": "https://registry.npmmirror.com/@intlify/shared/-/shared-9.14.4.tgz",
+      "integrity": "sha512-P9zv6i1WvMc9qDBWvIgKkymjY2ptIiQ065PjDv7z7fDqH3J/HBRBN5IoiR46r/ujRcU7hCuSIZWvCAFCyuOYZA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 16"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/kazupon"
+      }
+    },
     "node_modules/@jridgewell/gen-mapping": {
       "version": "0.3.13",
       "resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.13.tgz",
@@ -3831,6 +3876,32 @@
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       "license": "MIT"
     },
+    "node_modules/vue-i18n": {
+      "version": "9.14.4",
+      "resolved": "https://registry.npmmirror.com/vue-i18n/-/vue-i18n-9.14.4.tgz",
+      "integrity": "sha512-B934C8yUyWLT0EMud3DySrwSUJI7ZNiWYsEEz2gknTthqKiG4dzWE/WSa8AzCuSQzwBEv4HtG1jZDhgzPfWSKQ==",
+      "license": "MIT",
+      "dependencies": {
+        "@intlify/core-base": "9.14.4",
+        "@intlify/shared": "9.14.4",
+        "@vue/devtools-api": "^6.5.0"
+      },
+      "engines": {
+        "node": ">= 16"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/kazupon"
+      },
+      "peerDependencies": {
+        "vue": "^3.0.0"
+      }
+    },
+    "node_modules/vue-i18n/node_modules/@vue/devtools-api": {
+      "version": "6.6.4",
+      "resolved": "https://registry.npmmirror.com/@vue/devtools-api/-/devtools-api-6.6.4.tgz",
+      "integrity": "sha512-sGhTPMuXqZ1rVOk32RylztWkfXTRhuS7vgAKv0zjqk8gbsHkJ7xfFf+jbySxt7tWObEJwyKaHMikV/WGDiQm8g==",
+      "license": "MIT"
+    },
     "node_modules/vue-router": {
       "version": "5.0.3",
       "resolved": "https://registry.npmjs.org/vue-router/-/vue-router-5.0.3.tgz",