CONV-144: Implement JPG to PDF driver

[menvil]

Summary

• Implements JpgToPdfDriver at app/Conversion/Drivers/Image/JpgToPdfDriver.php
• Extracts shared PDF rendering logic into RendersSingleImagePdf trait to avoid duplication between PNG and JPG drivers
• Refactors PngToPdfDriver to use the same trait (same behaviour, less code)
• Both drivers embed source image as base64 data URI, render via dompdf, support all page/margin/fit options

Test plan

• JpgToPdfDriverTest passes (file exists, extension=pdf, mime=application/pdf, size>0)
• PngToPdfDriverTest still passes after refactor
• composer test passes (264 tests)
• composer lint passes

🤖 Generated with Claude Code

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Summary by cubic

Adds JPG→PDF conversion and unifies image-to-PDF rendering in a shared trait, reducing duplication while keeping PNG behavior unchanged. Fulfills CONV-144 and supports page size, orientation (including auto), margins, and fit options.

• New Features

  • Implemented JpgToPdfDriver that embeds the image as a base64 data URI and renders via barryvdh/laravel-dompdf.

• Refactors

  • Extracted RendersSingleImagePdf trait for shared rendering logic; updated PngToPdfDriver to use it with no behavior changes.

^{Written for commit 756770b. Summary will update on new commits.}

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/CONV-144-implement-jpg-to-pdf-driver

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