{"ok":true,"service":"stadium-counter-api","message":"Backend funcionando correctamente","input_sources":["camera_frames","uploaded_video"],"video_extensions":[".avi",".m4v",".mkv",".mov",".mp4",".webm"],"count_modes":["line_crossing","unique_video"],"tracking_layers":["YOLO person detection","ByteTrack","Body ReID","trajectory crossing","non-identifying face geometry assist"]}