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-vue3/11-before-hooks-and-expose/starter.js

@@ -0,0 +1,59 @@
+const {
+  createApp,
+  ref,
+  onBeforeMount,
+  onBeforeUpdate,
+  onBeforeUnmount,
+} = Vue;
+
+createApp({
+  components: {
+    ChildPanel: {
+      template: `
+        <div>
+          <p>我是子组件</p>
+          <input ref="inputEl" type="text" placeholder="等待父组件调用 focus" />
+        </div>
+      `,
+      setup(props, { expose }) {
+        const inputEl = ref(null);
+
+        onBeforeMount(() => {
+          // 任务：输出 beforeMount 日志
+        });
+
+        onBeforeUpdate(() => {
+          // 任务：输出 beforeUpdate 日志
+        });
+
+        onBeforeUnmount(() => {
+          // 任务：输出 beforeUnmount 日志
+        });
+
+        function focusInput() {
+          // 任务：聚焦 inputEl
+        }
+
+        // 任务：通过 expose 暴露 focusInput
+
+        return {
+          inputEl,
+        };
+      },
+    },
+  },
+  setup() {
+    const showChild = ref(true);
+    const childPanel = ref(null);
+
+    function focusChildInput() {
+      // 任务：调用 childPanel.value 暴露出来的方法
+    }
+
+    return {
+      showChild,
+      childPanel,
+      focusChildInput,
+    };
+  },
+}).mount("#app");