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/answer.js

@@ -0,0 +1,10 @@
+new Vue({
+  el: "#app",
+  data: {
+    nickname: "林晨",
+    goal: "希望独立完成一个 Vue2 管理后台页面。",
+    stage: "进阶",
+    pace: "每周集中学习",
+    skills: ["HTML", "CSS"],
+  },
+});