Add multi-framework dataset setup for RF-DETR, YOLOX, and YOLOv6

- Create dataset_coco/ for RF-DETR (COCO format)
- Rename dataset_split/ to dataset_yolo/ for clarity
- Add setup_datasets.py script for automated multi-format setup
- Update YOLOv6 script with correct 10-class configuration
- Update README with framework comparison and training instructions
- Update .gitignore to exclude both dataset directories

.gitignore

@@ -36,7 +36,8 @@ runs/
 # Dataset (large files)
 IMAGE/
 images/
-dataset_split/
+dataset_yolo/
+dataset_coco/
 *.jpg
 *.jpeg
 *.png