CONV-048: Add PNG to JPG converter capability

[menvil]

Summary

• Add PngToJpgConverter with options schema (quality, resize, background_color, remove_metadata).

Test plan

• composer test
• composer lint

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Summary by cubic

Add a PNG to JPG converter with configurable options and validation. Addresses CONV-048 by enabling quality, resize, background color, and metadata removal controls.

• New Features
  • Added PngToJpgConverter (key 'png:jpg'; source 'png'; target 'jpg'; label 'JPG'; description provided).
  • Options schema: quality (segmented: medium/high/best, default high), resize (select: original/1920/1280/custom, default original), background_color (color, default #ffffff), remove_metadata (toggle, default true).
  • validateOptions uses OptionsValidator to apply defaults and validate input.
  • Unit tests cover converter metadata and default options.

^{Written for commit 11d371a. Summary will update on new commits.}

Review in cubic

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/CONV-048-add-png-to-jpg-converter-capability

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