CONV-230: Enforce credits in CreateConversionJobAction

[menvil]

Summary

• CreateConversionJobAction now estimates cost and checks balance before creating job
• Throws InsufficientCreditsException when balance < estimated cost
• Creates ConversionCreditCharge with estimated status after job creation

Test plan

• CreateConversionJobActionCreditTest passes (3 tests)
• CreateConversionJobActionTest still passes (4 tests, no regression)

🤖 Generated with Claude Code

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Summary by cubic

Enforces credits during conversion job creation by estimating cost and checking the user's balance. If funds are sufficient we create the job and an estimated charge; otherwise we throw InsufficientCreditsException (CONV-230).

• New Features
  • Injects EstimateConversionCostAction and CreditLedger into CreateConversionJobAction.
  • Creates ConversionCreditCharge with status=Estimated, estimated_amount, and breakdown_json after job creation.
  • Keeps dispatch of ProcessConversionJob unchanged.

^{Written for commit cf6bfaa. 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-230-enforce-credits-in-create-conversion-job-action

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