[Request] Add ability to set custom icons for agent avatar

[trilin6]

🥰 Feature Description

As mentioned in #1100 (comment) (inactive)

I think this would be a great addition, the emojis are very limiting and make it more difficult to discern agents, as each LLMs unique logo is instantly recognizable by most people. I think it would make the entire application look and feel much nicer.

🧐 Proposed Solution

Add ability to upload custom file for avatar icon AND/OR choose an icon from the existing lobe-icons repository as this already contains most agents official icons that people would want to set anyway

📝 Additional Information

N/A

[lobehubbot]

👀 @trilin6

Thank you for raising an issue. We will investigate into the matter and get back to you as soon as possible.
Please make sure you have given us as much context as possible.
非常感谢您提交 issue。我们会尽快调查此事，并尽快回复您。 请确保您已经提供了尽可能多的背景信息。