New Features:
- Digital Signature tool: Sign PDFs with X.509 certificates (PFX/PEM)
- Visible and invisible signatures
- All pages, first page, last page, or custom page selection
- Dynamic signature height based on text content
- Custom signature text, image, and styling options
- Validate Signature tool: Verify digital signatures in PDFs
- Extract and parse PKCS#7 signatures
- View signer and issuer certificate details
- Check certificate validity and expiry
- Optional custom X.509 certificate for trust verification
- Full/partial coverage detection
Infrastructure:
- Added Cloudflare Worker CORS proxy for certificate chain fetching
- Updated README with new tools and proxy deployment instructions
Documentation:
- Added Digital Signature and Validate Signature to README tools table
- Added CORS proxy deployment guide for self-hosters
