feat: add Vue2 exercises for dynamic styles, lifecycle methods, component communication, and course management dashboard

- Implement dynamic styles and event handling in Vue2 with a card component.
- Create lifecycle methods exercise to simulate async data loading and instance destruction.
- Develop a component communication exercise with props, events, and slots.
- Build a comprehensive course management dashboard with filtering, statistics, and component interactions.

07-vue2/04-conditional-and-list-rendering/README.md

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+# 练习 4：条件渲染和列表渲染
+
+## 目标
+
+学会根据状态显示不同内容，并用 `v-for` 渲染一组数据。
+
+## 你要练什么
+
+- `v-if`
+- `v-else`
+- `v-show`
+- `v-for`
+- `:key`
+
+## 任务
+
+请基于页面结构完成以下操作：
+
+- 切换“是否展开课程列表”
+- 根据是否付费显示不同文案
+- 用 `v-for` 渲染课程数组
+
+## 文件
+
+- [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/04-conditional-and-list-rendering/starter.html)
+- [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/04-conditional-and-list-rendering/starter.js)
+- [answer.html](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/04-conditional-and-list-rendering/answer.html)
+- [answer.js](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/04-conditional-and-list-rendering/answer.js)