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-vue3/12-built-in-components/starter.js

@@ -0,0 +1,24 @@
+const { createApp, ref } = Vue;
+
+createApp({
+  components: {
+    AsyncInfo: {
+      async setup() {
+        // 任务：
+        // 1. 模拟等待
+        // 2. 返回需要在模板中展示的数据
+        return {};
+      },
+      template: `
+        <p>这里会展示异步组件内容。</p>
+      `,
+    },
+  },
+  setup() {
+    const showModal = ref(false);
+
+    return {
+      showModal,
+    };
+  },
+}).mount("#app");