[FEATURE] Support for openrouter.ai model endpoints

[majerus1223]

📋 Prerequisites

• I have searched the existing issues to avoid creating a duplicate
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📝 Feature Summary

Provide support for openrouter.ai in the model drop down

❓ Problem Statement / Motivation

Openrouter provides a mechanism to try various models in one location, with one billing subscription. This is useful for testing multiple vendor models in a way that has a low barrier to entry.

💡 Proposed Solution

Support openrouter in this ui..

🔄 Alternatives Considered

No response

🎯 Affected Service(s)

None

📚 Additional Context

No response

🙋 Are you willing to contribute?

• I am willing to submit a PR for this feature