Implement basic /api/frame/:theme/:username endpoint

[techquantacommunity]

• Fetch GitHub avatar image using username
• Overlay it with the base frame from public/frames/base
• Return the framed image as PNG
• Ensure TypeScript is used.

[shivram9]

Hi, I’d like to work on this. I’ll fetch GitHub avatars by username, overlay them with the base frame from public/frames/base, and return the framed image as PNG using TypeScript. Please assign me this issue. 🚀

[shivram9]

Can u please check the changes