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-vue3/06-slots-and-provide-inject/README.md

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+# 练习 6：slot 与 provide / inject
+
+## 目标
+
+学会更灵活地组织组件树中的内容和共享信息。
+
+## 你要练什么
+
+- `slot`
+- `provide`
+- `inject`
+
+## 任务
+
+- 用插槽自定义卡片按钮文案
+- 父组件通过 `provide` 提供主题色
+- 子组件通过 `inject` 使用主题信息
+
+## 文件
+
+- [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/08-vue3/06-slots-and-provide-inject/starter.html)
+- [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/08-vue3/06-slots-and-provide-inject/starter.js)