refactor(vnt-web): 前端重构为 Vite+Vue3+Pinia 工程并重新设计 UI

- 单文件 index.html 拆分为 vnt-web/ui(pnpm+Vite+Vue3 SFC+Pinia+Tailwind v4),构建产物输出到 static/
- UI 重新设计:浅色简洁风(可切换深色模式)、顶部导航、新增总览仪表盘首页
- 自定义弹窗/toast/确认框替换全部原生 alert/confirm,交互与过渡统一
- 响应式布局:移动端汉堡导航,表格与卡片自适应
- 实例卡片移除日志按钮;启动组网默认选中第一个配置

vnt-web/ui/package.json

@@ -0,0 +1,21 @@
+{
+  "name": "vnt-web-ui",
+  "private": true,
+  "version": "2.0.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build"
+  },
+  "dependencies": {
+    "pinia": "^3.0.3",
+    "vue": "^3.5.18",
+    "vue-router": "^4.5.1"
+  },
+  "devDependencies": {
+    "@tailwindcss/vite": "^4.1.12",
+    "@vitejs/plugin-vue": "^6.0.1",
+    "tailwindcss": "^4.1.12",
+    "vite": "^7.1.3"
+  }
+}