Bug: 401 Unauthorized and content-blocked errors via AgentRouter (OpenAI Compatible) Provider

Description

Describe the bug

When trying to use custom models (GPT-5.6 Sol and Claude 4.8 Opus) routed through AgentRouter (https://agentrouter.org) using the OpenAI Compatible provider configuration, the extension fails to handle responses. It either returns empty streaming text or throws a "401 unauthorized client detected" error due to Alibaba Cloud WAF / security rules blocking the extension's user-agent/headers.

To Reproduce

1. Configure config.yaml with an OpenAI compatible provider pointing to https://agentrouter.org.
2. Add models gpt-5.6-sol or claude-opus-4-8.
3. Open a new session and send a message.
4. Observe the empty response or the 401 Unauthorized popup.

Expected behavior

The extension should successfully pass the required headers or allow user-agent customization so that proxy platforms/WAF providers do not flag the API requests as bot/malicious activity.

Plugins

OpenAI Compatible Provider (via AgentRouter)

OpenCode version

No response

Steps to reproduce

No response

Screenshot and/or share link

Operating System

Windows 11

Terminal

No response