- Add extractEPUBCover() to extract embedded covers from EPUB files
- Parse OPF manifest for cover-image properties
- Support meta name="cover" tags
- Fall back to common cover paths (cover.jpg, images/cover.jpg)
- Add findSidecarCover() for sidecar cover detection
- Check cover.jpg, cover.png, cover.webp
- Check folder.jpg, folder.png
- Check {basename}.jpg (same name as media file)
- Add extractPDFCover() to extract first page images from PDFs
- Use pdfcpu API to extract images from page 1
- Save largest image as cover
- Update extractPDFMetadata() to use pdfcpu API
- Extract Title, Author, Subject, Creator, Producer
- Call extractPDFCover for embedded covers
- Fall back to sidecar covers
- Update extractMetadata() for EPUB to call extractEPUBCover
- Try embedded cover first, then sidecar