Font Awesome Icon Proxy

Usage: /icon/:name?size=64&color=000000&bg=ffffff&padding=10&format=png

Parameters:
- name: Font Awesome icon name (e.g., heart, star, user)
- size: Icon size in pixels (16-512, default: 64)
- color: Hex color without # (default: 000000)
- bg: Background color without # (optional, transparent if not set)
- padding: Padding as percentage of size (0-50, default: 0)
- format: Output format - png or svg (default: png)

Examples:
- /icon/heart
- /icon/star?size=128&color=ff0000
- /icon/user?size=32&color=0066cc&format=svg
- /icon/github?size=96&color=333333&bg=f0f0f0&padding=10
- /icon/check?size=48&color=00ff00&bg=000000&padding=20

All icons are solid style Font Awesome icons.