Add script support for gRPC services

## For HTTP services, we can set scripts:

<img width="769" height="202" alt="Image" src="https://github.com/user-attachments/assets/d803ba84-6e48-4277-8745-69a543eef942" />



## But not for gRPC services, there's no scuh option:

<img width="416" height="123" alt="Image" src="https://github.com/user-attachments/assets/01db466b-06e3-4d6c-bc25-c1074a3a590e" />