fix(media): 更新视频背景组件的默认资源路径

将默认视频和背景图片的URL从旧的recall目录更新到新的video目录，以匹配最新的资源组织结构。

 <!--
  * @Date: 2025-12-26 14:15:46
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-12-31 16:47:19
- * @FilePath: /mlaj/src/components/ui/VideoBackground.vue
+ * @LastEditTime: 2026-01-28 17:42:34
+ * @FilePath: /mlaj/src/components/media/VideoBackground.vue
  * @Description: 文件描述
 -->
 <template>
@@ -34,12 +34,13 @@ const props = defineProps({
     videoUrl: {
         type: String,
         // default: 'https://cdn.ipadbiz.cn/mlaj/recall/video/%E5%AE%87%E5%AE%99-1.mp4'
-        default: 'https://cdn.ipadbiz.cn/mlaj/recall/video/u8yvl6rs7q.mp4'
+        // default: 'https://cdn.ipadbiz.cn/mlaj/recall/video/u8yvl6rs7q.mp4'
+        default: 'https://cdn.ipadbiz.cn/mlaj/video/welcome-bg.mp4'
     },
     backgroundImage: {
         type: String,
         // default: 'https://cdn.ipadbiz.cn/mlaj/recall/video/%E5%AE%87%E5%AE%99-2.png'
-        default: 'https://cdn.ipadbiz.cn/mlaj/recall/img/i3a85rdk.png'
+        default: 'https://cdn.ipadbiz.cn/mlaj/video/welcome-bg.mp4?vframe/jpg/offset/0.001'
     }
 })