add zeroGPU support

is this implementation correct?

@atalaydenknalbant

app.py

@@ -1,4 +1,6 @@
 import gradio as gr
+import spaces
+
 import sahi.utils
 from sahi import AutoDetectionModel
 import sahi.predict
@@ -39,6 +41,7 @@ sahi.utils.file.download_from_url(
 # Global model variable
 model = None
 
+@spaces.GPU(duration=60)
 def load_yolo_model(model_name, confidence_threshold=0.5):
     """
     Loads a YOLOv11 detection model.
@@ -53,11 +56,12 @@ def load_yolo_model(model_name, confidence_threshold=0.5):
     global model
     model_path = model_name
     model = AutoDetectionModel.from_pretrained(
-        model_type="ultralytics", model_path=model_path, device="cpu",
+        model_type="ultralytics", model_path=model_path, device=None, # auto device selection
         confidence_threshold=confidence_threshold, image_size=IMAGE_SIZE
     )
     return model
 
+@spaces.GPU(duration=60)
 def sahi_yolo_inference(
     image,
     yolo_model_name,