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-vue2/03-v-model-and-form/README.md

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+# 练习 3：v-model 和表单
+
+## 目标
+
+学会用 `v-model` 处理输入、选择和实时预览。
+
+## 你要练什么
+
+- `v-model`
+- 输入框
+- 多行文本
+- 下拉框
+- 单选框
+- 复选框
+
+## 任务
+
+请基于页面结构完成以下操作：
+
+- 输入昵称并实时显示
+- 输入学习目标并实时显示
+- 选择当前阶段并显示结果
+- 选择偏好的学习节奏
+- 勾选已经掌握的基础能力
+
+## 文件
+
+- [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/03-v-model-and-form/starter.html)
+- [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/03-v-model-and-form/starter.js)
+- [answer.html](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/03-v-model-and-form/answer.html)
+- [answer.js](/Users/lijiaqing/home/wwwroot/front-end-example/07-vue2/03-v-model-and-form/answer.js)