CONV-219: Add conversion costs config

[menvil]

Summary

• Adds config/conversion_costs.php with MVP pricing rules
• Image-to-image costs 1 credit, image-to-pdf costs 2 credits
• Defines format groups: image (png, jpg, jpeg, webp) and pdf

Test plan

• ConversionCostsConfigTest passes (3 tests)

🤖 Generated with Claude Code

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Summary by cubic

Add conversion costs config for MVP pricing per CONV-219, with image-to-image at 1 credit and image-to-pdf at 2 credits. Also defines format groups for image (png, jpg, jpeg, webp) and pdf.

^{Written for commit 70ce0bd. Summary will update on new commits.}

[coderabbitai]

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🧪 Generate unit tests (beta)

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• Commit unit tests in branch feature/CONV-219-add-conversion-costs-config

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