abdullahalam123 05110c7f6a feat: Add Digital Signature and Validate Signature tools ...

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

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..

.backup-related-tools-fix

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add-attachments.html

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add-blank-page.html

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add-stamps.html

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add-watermark.html

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alternate-merge.html

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background-color.html

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bmp-to-pdf.html

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bookmark.html

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cbz-to-pdf.html

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change-permissions.html

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combine-single-page.html

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compare-pdfs.html

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compress-pdf.html

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crop-pdf.html

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csv-to-pdf.html

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decrypt-pdf.html

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delete-pages.html

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digital-sign-pdf.html

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divide-pages.html

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edit-attachments.html

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edit-metadata.html

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edit-pdf.html

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encrypt-pdf.html

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epub-to-pdf.html

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excel-to-pdf.html

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extract-attachments.html

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extract-images.html

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extract-pages.html

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extract-tables.html

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fb2-to-pdf.html

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fix-page-size.html

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flatten-pdf.html

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form-creator.html

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form-filler.html

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header-footer.html

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heic-to-pdf.html

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image-to-pdf.html

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invert-colors.html

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jpg-to-pdf.html

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json-to-pdf.html

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linearize-pdf.html

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markdown-to-pdf.html

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merge-pdf.html

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mobi-to-pdf.html

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n-up-pdf.html

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ocr-pdf.html

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odg-to-pdf.html

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odp-to-pdf.html

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ods-to-pdf.html

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odt-to-pdf.html

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organize-pdf.html

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page-dimensions.html

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page-numbers.html

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pages-to-pdf.html

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pdf-booklet.html

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pdf-layers.html

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pdf-multi-tool.html

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pdf-to-bmp.html

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pdf-to-csv.html

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pdf-to-docx.html

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pdf-to-excel.html

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pdf-to-greyscale.html

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pdf-to-jpg.html

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pdf-to-json.html

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pdf-to-markdown.html

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pdf-to-pdfa.html

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pdf-to-png.html

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pdf-to-svg.html

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pdf-to-text.html

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pdf-to-tiff.html

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pdf-to-webp.html

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pdf-to-zip.html

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png-to-pdf.html

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posterize-pdf.html

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powerpoint-to-pdf.html

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prepare-pdf-for-ai.html

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psd-to-pdf.html

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pub-to-pdf.html

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rasterize-pdf.html

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remove-annotations.html

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remove-blank-pages.html

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remove-metadata.html

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remove-restrictions.html

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repair-pdf.html

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reverse-pages.html

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rotate-custom.html

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rotate-pdf.html

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rtf-to-pdf.html

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sanitize-pdf.html

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sign-pdf.html

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split-pdf.html

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svg-to-pdf.html

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table-of-contents.html

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text-color.html

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tiff-to-pdf.html

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txt-to-pdf.html

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validate-signature-pdf.html

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view-metadata.html

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vsd-to-pdf.html

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webp-to-pdf.html

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word-to-pdf.html

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wpd-to-pdf.html

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wps-to-pdf.html

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xml-to-pdf.html

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xps-to-pdf.html

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