CONV-261: Test credit pack checkout creation

[menvil]

Summary

• Adds failing tests for BillingPaymentService::createCreditPackCheckout()
• Tests verify: checkout creation returns CheckoutSessionDto, null stripePriceId throws InvalidArgumentException
• Tests use FakeSubscriptionCheckoutGateway (no real Stripe calls)
• Tests fail with "Call to undefined method" — intentional, implementation comes in CONV-262

Test plan

• Tests confirmed failing before implementation
• composer lint passes

🤖 Generated with Claude Code

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Summary by cubic

Adds failing tests for credit pack checkout creation per CONV-261. Tests cover the happy path and null stripePriceId error for BillingPaymentService::createCreditPackCheckout() using a fake checkout gateway (no real Stripe calls).

^{Written for commit 42a82c6. Summary will update on new commits.}

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• Commit unit tests in branch feature/CONV-261-test-credit-pack-checkout-creation

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