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-vue3/10-next-tick-and-component-v-model/starter.js

@@ -0,0 +1,52 @@
+const { createApp, ref, nextTick, watch } = Vue;
+
+createApp({
+  components: {
+    SearchInput: {
+      props: {
+        modelValue: {
+          type: String,
+          default: "",
+        },
+      },
+      emits: ["update:modelValue"],
+      template: `
+        <input
+          ref="inputEl"
+          :value="modelValue"
+          type="text"
+          placeholder="请输入课程关键字"
+          @input="$emit('update:modelValue', $event.target.value)"
+        />
+      `,
+      methods: {
+        focus() {
+          this.$refs.inputEl.focus();
+        },
+      },
+    },
+  },
+  setup() {
+    const showSearch = ref(false);
+    const keyword = ref("");
+    const searchBox = ref(null);
+
+    watch(keyword, (newValue) => {
+      // 任务：在控制台输出关键字变化
+    });
+
+    async function toggleSearch() {
+      // 任务：
+      // 1. 切换 showSearch.value
+      // 2. 如果展开了，await nextTick()
+      // 3. 通过 searchBox.value.focus() 聚焦输入框
+    }
+
+    return {
+      showSearch,
+      keyword,
+      searchBox,
+      toggleSearch,
+    };
+  },
+}).mount("#app");