CONV-217: Create ConversionCostEstimator contract

[menvil]

Summary

• Adds ConversionCostEstimator interface in App\Contracts\Billing
• Method estimate(FileRecord, Converter, array): CreditCost defines the estimation API

Test plan

• ConversionCostEstimatorContractTest passes (1 test)

🤖 Generated with Claude Code

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Summary by cubic

Implements CONV-217 by adding the App\Contracts\Billing\ConversionCostEstimator contract to standardize credit cost estimation for file conversions. Defines estimate(FileRecord $file, Converter $converter, array $options = []): CreditCost and includes a unit test to confirm the interface exists.

^{Written for commit 0f6bfea. 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-217-create-conversion-cost-estimator-contract

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