Add @spaces.GPU decorator to load_model function

Fixes CUDA initialization error in main process on HF Spaces

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app.py

@@ -14,6 +14,7 @@ pipe = None
 device = "cuda" if torch.cuda.is_available() else "cpu"
 
 
+@spaces.GPU
 def load_model(model_path):
     """Load the CogVideoX-Interpolation model"""
     global pipe