fix(search): 更新视频和公告的返回值描述

- 将视频返回值描述从'视频'更新为'视频教程'
- 将公告返回值描述从'公告'更新为'产品公告'以提供更清晰的信息

app/controller/frontend/SearchController.php

@@ -124,10 +124,10 @@ class SearchController extends BaseController
             return ['download', '下载中心'];
         }
         if (isset($sets['video'][$contentId])) {
-            return ['video', '视频'];
+            return ['video', '视频教程'];
         }
         if (isset($sets['announce'][$contentId])) {
-            return ['announce', '公告'];
+            return ['announce', '产品公告'];
         }
         return ['content', '内容'];
     }