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-vue3/02-reactive-and-computed/README.md

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+# 练习 2：reactive 和 computed
+
+## 目标
+
+学会把一组相关数据放进 `reactive`，并用 `computed` 推导派生结果。
+
+## 你要练什么
+
+- `reactive`
+- `computed`
+- 响应式对象
+- 派生状态
+
+## 任务
+
+- 用 `reactive` 管理课程信息
+- 用 `computed` 计算进度文案
+- 点击按钮后让完成课时增加
+
+## 文件
+
+- [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/08-vue3/02-reactive-and-computed/starter.html)
+- [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/08-vue3/02-reactive-and-computed/starter.js)