[Feature Request] made AI provider support on  Opencode Zen & Go

### Describe the solution you'd like

base url is at 

Zen : https://opencode.ai/zen/v1/
Go : https://opencode.ai/zen/go/v1/

for now it can seen all models from provider in setting menu but after try chat with agent it always got "Failed to fetch" error message

<img width="525" height="202" alt="Image" src="https://github.com/user-attachments/assets/dbf186f2-6a4b-4573-98b7-38df36faef72" />