Rust PDF-to-JPG converter clamps megapixels to avoid OOM crashes

A developer building a 600 DPI PDF-to-JPG converter in Rust with libvips found that large-format PDFs could produce multi-gigabyte images, crashing servers. They implemented a megapixel clamp that adaptively reduces resolution while preserving the requested DPI for normal pages. The fix, now running on Convertify, prevents memory exhaustion without silently downgrading all conversions.