CONV-216: Create CreditCostBreakdown DTO

[menvil]

Summary

• Adds CreditCostBreakdown immutable readonly DTO with base, size, features, total, details fields
• Implements toArray() method for serialization
• Validates all numeric fields cannot be negative

Test plan

• CreditCostBreakdownTest passes (7 tests)

🤖 Generated with Claude Code

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Summary by cubic

Implements CONV-216 by introducing a CreditCostBreakdown immutable DTO to represent credit pricing breakdown. Provides simple serialization for API responses.

• New Features
  • Readonly DTO with fields: base, size, features, total, details.
  • toArray() method for easy serialization.
  • Validates numeric fields are non-negative (throws InvalidArgumentException); unit tests cover creation, field exposure, array conversion, and validation.

^{Written for commit b41f371. 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-216-create-credit-cost-breakdown-dto

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