Feature Request: Add Support for OpenRouter API

[Keldon-Pro]

I would like to request the addition of support for the OpenRouter API integration.

This feature would significantly enhance the utility and accessibility of this project, especially for users who need flexibility in choosing models and those in specific geographic regions.

🚀 Rationale:

1. Model Diversity: OpenRouter integrates a vast array of Large Language Models (LLMs) from different vendors (e.g., Anthropic, Google, various open-source models). Adding support would instantly give magentic-ui users access to this extensive catalog of models.
2. OpenAI Compatibility: OpenRouter's API is fully compatible with the OpenAI API standard. This makes integration straightforward and requires minimal changes, likely leveraging existing OpenAI API communication logic.
3. Enhanced Accessibility for Global Users (Especially China):
   • Many LLM providers, including OpenAI and Anthropic, do not directly support users in the China region.
   • OpenRouter provides a convenient and accessible gateway for users in this region to indirectly utilize models from these providers, bypassing the current geographic restrictions.

Implementing OpenRouter support would align the project with a broader, more open ecosystem of LLMs and remove a significant barrier for a large group of potential users.

Thank you for considering this request!

[gitglubber]

@Keldon-Pro OpenRouter uses an OPENAI compatible Api. I have used Magentic-UI with OpenRouter successfully.

your base url is just 'https://openrouter.ai/api/v1'