feat: 添加bbs前端搭建

Yi.BBS.Vue3/src/layout/AppHeader.vue

@@ -0,0 +1,32 @@
+<template>
+  <el-menu
+    :default-active="activeIndex"
+    class="el-menu-demo"
+    mode="horizontal"
+    @select="handleSelect"
+  >
+    <el-menu-item index="1">Processing Center</el-menu-item>
+    <el-sub-menu index="2">
+      <template #title>Workspace</template>
+      <el-menu-item index="2-1">item one</el-menu-item>
+      <el-menu-item index="2-2">item two</el-menu-item>
+      <el-menu-item index="2-3">item three</el-menu-item>
+      <el-sub-menu index="2-4">
+        <template #title>item four</template>
+        <el-menu-item index="2-4-1">item one</el-menu-item>
+        <el-menu-item index="2-4-2">item two</el-menu-item>
+        <el-menu-item index="2-4-3">item three</el-menu-item>
+      </el-sub-menu>
+    </el-sub-menu>
+    <el-menu-item index="3" disabled>Info</el-menu-item>
+    <el-menu-item index="4">Orders</el-menu-item>
+  </el-menu>
+
+</template>
+<script setup>
+import { ref } from 'vue'
+const activeIndex = ref('1')
+const handleSelect = (key, keyPath) => {
+  console.log(key, keyPath)
+}
+</script>