CONV-142: Implement PNG to PDF driver

[menvil]

Summary

• Implements PngToPdfDriver at app/Conversion/Drivers/Image/PngToPdfDriver.php
• Embeds PNG as base64 data URI in a Blade HTML template, renders to PDF via barryvdh/laravel-dompdf
• Supports page_size (a4/letter/a3), orientation (portrait/landscape/auto), margin (none/small/medium/large), fit_mode (contain/fill/original)
• orientation: auto determines from image dimensions (landscape if width > height)
• Returns ConversionResult with %PDF header verified in tests; does not mutate models
• Shared Blade template at resources/views/pdf/single-image.blade.php (reused by CONV-144)

Test plan

• PngToPdfDriverTest passes (file exists, extension=pdf, mime=application/pdf, size>0, starts with %PDF)
• composer test passes (263 tests)
• composer lint passes

🤖 Generated with Claude Code

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Summary by cubic

Adds a PNG→PDF conversion driver that renders a single image to PDF via barryvdh/laravel-dompdf. Fulfills CONV-142 with options for page size, orientation (auto), margins, and fit.

• New Features
  • New PngToPdfDriver (png_to_pdf) using shared Blade view pdf/single-image.
  • Auto orientation chooses landscape when width > height; margins map to CSS mm values.
  • Supports fit_mode: contain, fill, original.
  • Writes result.pdf to the output directory and returns a ConversionResult with PDF metadata.

^{Written for commit 2ebe496. 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-142-implement-png-to-pdf-driver

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