refactor: 移除AppLayout组件中的title属性并优化用户信息显示

移除多个页面中AppLayout组件的title属性，简化代码结构。同时优化HomePage.vue中的用户信息显示，增加默认头像和用户名处理，提升用户体验

 <!--
  * @Date: 2025-03-20 19:55:21
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-03-24 18:00:18
+ * @LastEditTime: 2025-03-24 18:10:32
  * @FilePath: /mlaj/src/views/HomePage.vue
  * @Description: 亲子学院首页组件
  *
@@ -38,13 +38,12 @@
             <div class="flex items-center">
               <div class="w-10 h-10 rounded-full overflow-hidden mr-3">
                 <img
-                  :src="currentUser.avatar"
-                  :alt="currentUser.name"
+                  :src="currentUser?.avatar || 'https://cdn.ipadbiz.cn/mlaj/images/user-avatar-2.jpg'"
                   class="w-full h-full object-cover"
                   @error="handleImageError" />
               </div>
               <div>
-                <h2 class="text-xl font-bold">欢迎回来，{{ currentUser.name }}！</h2>
+                <h2 class="text-xl font-bold">欢迎回来，{{ currentUser.name || '登录用户' }}！</h2>
                 <p class="text-sm text-gray-500">{{ formatToday() }}</p>
               </div>
             </div>

 <template>
-  <AppLayout title="课程详情" :rightContent="rightContent">
+  <AppLayout :rightContent="rightContent">
     <div class="pb-24">
       <!-- Course Header -->
       <div class="bg-gradient-to-b from-red-500 to-red-600 p-4 mb-4 rounded-b-3xl shadow-lg">

 <template>
-  <AppLayout title="课程" :rightContent="rightContent">
+  <AppLayout :rightContent="rightContent">
     <div class="pb-16">
       <!-- Search Bar -->
       <div class="pb-2">

 <template>
-  <AppLayout title="我的" :right-content="rightContent">
+  <AppLayout :right-content="rightContent">
     <div
       class="bg-gradient-to-br from-green-50 via-green-100/30 to-blue-50/30 min-h-screen"
     >