GET http://localhost:5155/gw_ai_class/api/videos_all/领导讲话专题/第1天 超级复杂的领导讲话/
For JSON format, add the query parameter: ?format=json
GET http://localhost:{{port}}/folder/videos_all/领导讲话专题/第1天 超级复杂的领导讲话/
Always returns JSON with directory structure and navigation links