fix: hide instance_id from segmentation overlay labels

Display only the class name on bounding boxes instead of
"instance_id class_name". The instance_id is still preserved
in job detection data.

Co-Authored-By: Claude Opus 4.6 <[email protected]>

inference.py

@@ -1233,7 +1233,7 @@ def _gsam2_render_frame(
 
     for _obj_id, obj_info in frame_objects.items():
         mask = obj_info.mask
-        label = f"{obj_info.instance_id} {obj_info.class_name}"
+        label = obj_info.class_name
         if mask is not None:
             if isinstance(mask, torch.Tensor):
                 mask_np = mask.cpu().numpy().astype(bool)