Fix ZeroGPU runtime check by adding @spaces.GPU probe function

app.py

@@ -1,5 +1,11 @@
 import gradio as gr
 import random
+import spaces
+
+
+@spaces.GPU
+def _hf_zerogpu_probe():
+    return None
 
 _TITLE = '''
 # Sparc3D: Next-Gen High-Resolution 3D Model Generation