[Feature]: Add ai-gateway from Vercel

[ciltocruz]

Existing issues

• I searched existing issues and did not find a duplicate.

Problem or use case

It would be good to add the Vercel provider (AI Gateway).

Proposed solution

I haven't looked into the platform much, but logging into OpenCode and other agents is done via API key.

Affected area

• Tray panel
• Settings UI
• Config file / settings persistence
• CLI
• Provider-specific behavior
• Installer / release packaging
• Startup / background behavior
• Documentation
• Other

Alternatives considered

No response

Visual details

No response

Additional context

No response

[Finesssee]

Thanks for the request, I will check on it ASAP.