CONV-228: Create ConversionCreditCharge model and migration

[menvil]

Summary

• Adds conversion_credit_charges table migration with user_id, conversion_job_id, estimated/captured/refunded amounts, status, and breakdown_json
• Adds ConversionCreditCharge model with user/conversionJob relationships
• Adds ConversionCreditChargeStatus enum (estimated, captured, refunded, failed)
• Adds ConversionCreditChargeFactory with state helpers

Test plan

• ConversionCreditChargeTest passes (4 tests)

🤖 Generated with Claude Code

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Summary by cubic

Implements credit charge tracking for conversions (CONV-228) by adding a new table and model. Supports estimating, capturing, and refunding user credits per conversion job.

• New Features
  • New conversion_credit_charges table with user_id, conversion_job_id (nullable), estimated/captured/refunded amounts, status, breakdown_json; indexes on (user_id, status) and conversion_job_id.
  • ConversionCreditCharge model with enum cast for status and array cast for breakdown_json; relations to User and ConversionJob.
  • ConversionCreditChargeStatus enum: estimated, captured, refunded, failed.
  • ConversionCreditChargeFactory with estimated, captured, and failed state helpers.

^{Written for commit 2cc88b9. 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-228-create-conversion-credit-charge-model-and-migration

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