fix: 修正欢迎页活动入口图标错误

将课程入口图标从welcome_btn_1.png改为welcome_btn_3.png
将活动入口图标从welcome_btn_1.png改为welcome_btn_2.png

 /*
  * @Date: 2025-01-28 12:00:00
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2026-01-28 17:27:08
+ * @LastEditTime: 2026-01-28 17:37:19
  * @FilePath: /mlaj/src/config/welcomeEntries.js
  * @Description: 欢迎页功能入口配置
  */
@@ -14,14 +14,14 @@ export const welcomeEntries = [
   {
     id: 'courses',
     title: '课程',
-    icon: 'https://cdn.ipadbiz.cn/mlaj/images/welcome_btn_1.png',
+    icon: 'https://cdn.ipadbiz.cn/mlaj/images/welcome_btn_3.png',
     route: '/courses',
     priority: 1
   },
   {
     id: 'activity',
     title: '活动',
-    icon: 'https://cdn.ipadbiz.cn/mlaj/images/welcome_btn_1.png',
+    icon: 'https://cdn.ipadbiz.cn/mlaj/images/welcome_btn_2.png',
     route: '/activity',
     priority: 2,
     isExternal: true,