Add Support for agentrouter

[lutfi-haslab]

Description

Agent Router just launch with support api fro OpenAI and Anthropic. That would be great if you add support for Agent Router. I try using Agent Router api with Deepseek example for Compatible OpenAI, but i got this maximum retry attempts reached for rate limit: 8 retries
2025/09/22 14:58:36 WARN Retrying due to rate limit attempt=8 error="POST \"https://agentrouter.org/v1/messages\": 401 Unauthorized {\"message\":\"UNAUTHENTICATED\",\"success\":false}"

for more information https://agentrouter.org