Implement AVIF image content negotiation with WebP fallback for
cloonar.dev website. Browser will receive AVIF if supported and
available, otherwise WebP, falling back to original JPEG/PNG.
- Add AVIF-first content negotiation in image location block
- Maintain existing WebP fallback logic
- Include .avif in long-term cache headers (365d)
- Add Vary: Accept header for proper CDN/browser caching
AVIF files should be placed at /avif/$request_uri.avif to be served.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
