GET http://localhost:5155/gw_ai_class/api/videos_all/调研报告专题/第1天 调研报告、机关论文整体规律及特点/
For JSON format, add the query parameter: ?format=json
GET http://localhost:{{port}}/folder/videos_all/调研报告专题/第1天 调研报告、机关论文整体规律及特点/
Always returns JSON with directory structure and navigation links