CONV-052: Add JPG to PNG converter capability

[menvil]

Summary

• Add JpgToPngConverter with resize and remove_metadata options.

Test plan

• composer test
• composer lint

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Summary by cubic

Implements CONV-052 by adding a JPG to PNG converter with optional resize and metadata stripping. Includes an options schema with validation and unit tests.

• New Features
  • Added JpgToPngConverter (key: jpg:png) with label "PNG" and description.
  • Options: resize (original, 1920, 1280, custom) and remove_metadata (default true), validated via OptionsValidator.
  • Unit tests verify capability metadata and default options.

^{Written for commit d62cef0. 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-052-add-jpg-to-png-converter-capability

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