CONV-223: Implement image to PDF cost

[menvil]

Summary

• Image-to-PDF cost (2 credits) was implemented in CONV-221 as part of the estimator
• Adds PNG→WEBP test case to complete coverage of all image-to-image variants

Test plan

• ConversionCostEstimatorTest passes (5 tests total)

🤖 Generated with Claude Code

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Summary by cubic

Ensure the estimator charges 2 credits for image to PDF per CONV-223. Add a PNG to WEBP test to complete image-to-image coverage and assert 1 credit.

^{Written for commit 3c2c0f8. 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-223-implement-image-to-pdf-cost

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