feat: Add Vue3 exercises and interview plan

- Introduced Vue3 exercises covering composable API, reactivity, lifecycle hooks, and built-in components.
- Added structured interview plan for frontend candidates focusing on HTML, CSS, JavaScript, TypeScript, and Vue.
- Included starter files for each exercise and detailed README documentation for guidance.

08-vue3/12-built-in-components/README.md

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+# 练习 12：Teleport、Suspense 和 Transition
+
+## 目标
+
+认识 Vue3 常见内置组件在实际页面里的使用方式。
+
+## 你要练什么
+
+- `Teleport`
+- `Suspense`
+- `Transition`
+
+## 任务
+
+- 用 `Teleport` 把弹层渲染到 `body`
+- 用 `Transition` 给弹层或提示做显隐动画
+- 用 `Suspense` 包裹一个异步组件，并显示 fallback
+
+## 文件
+
+- [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/08-vue3/12-built-in-components/starter.html)
+- [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/08-vue3/12-built-in-components/starter.js)