cupy-cuda12x should no longer be a mandatory dependency

as https://github.com/weAIDB/ST-Raptor/issues/4 had been resolved,  ST-Raptor should could be run on local 

<img width="1209" height="101" alt="Image" src="https://github.com/user-attachments/assets/0a2b2b7d-6d0f-454f-856e-47c457f8d723" />