CONV-241: Create BillingPlan DTO

[menvil]

Summary

• Created App\Billing\BillingPlanDto — final readonly class covering key/label/stripePriceId/monthlyCredits/isPaid
• Added unit test verifying DTO construction and field access

Test plan

• composer test passes (431 tests)
• composer lint passes

🤖 Generated with Claude Code

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Summary by cubic

Implements CONV-241 by adding a final readonly App\Billing\BillingPlanDto to standardize billing plan metadata, plus a unit test to verify construction and field access. This centralizes plan data (key, label, stripePriceId, monthlyCredits, isPaid) for upcoming billing features.

^{Written for commit 7923bfb. 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-241-create-billing-plan-dto

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