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-vue3/05-props-and-emits/starter.js

@@ -0,0 +1,39 @@
+const { createApp } = Vue;
+
+createApp({
+  components: {
+    CourseItem: {
+      props: {
+        course: {
+          type: Object,
+          required: true,
+        },
+      },
+      emits: ["toggle"],
+      template: `
+        <article class="card">
+          <h2>{{ course.title }}</h2>
+          <p :class="{ done: course.finished }">
+            {{ course.finished ? "已完成" : "学习中" }}
+          </p>
+          <button type="button" @click="$emit('toggle', course.id)">切换状态</button>
+        </article>
+      `,
+    },
+  },
+  setup() {
+    const courses = Vue.ref([
+      { id: 1, title: "组合式 API", finished: true },
+      { id: 2, title: "组件通信", finished: false },
+    ]);
+
+    function toggleCourse(courseId) {
+      // 任务：根据 courseId 切换对应课程的 finished
+    }
+
+    return {
+      courses,
+      toggleCourse,
+    };
+  },
+}).mount("#app");