CONV-243/244: Test and implement BillingPaymentService subscription checkout

[menvil]

Summary

• CONV-243: Added failing test for BillingPaymentService::createSubscriptionCheckout
• CONV-244: Implemented BillingPaymentService with gateway abstraction pattern
  • SubscriptionCheckoutGateway interface isolates Cashier from the service
  • CashierSubscriptionCheckoutGateway — production implementation using Cashier
  • FakeSubscriptionCheckoutGateway — test double (no real Stripe calls)
  • CheckoutSessionDto — return type carrying checkout URL
  • CannotCheckoutFreePlanException — thrown when free plan checkout is attempted
  • Bound SubscriptionCheckoutGateway → CashierSubscriptionCheckoutGateway in AppServiceProvider

Test plan

• composer test passes (437 tests)
• composer lint passes
• No direct Cashier calls outside gateway layer

🤖 Generated with Claude Code

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Summary by cubic

Implements subscription checkout in BillingPaymentService using a gateway abstraction to meet CONV-243/244. Free plans are blocked; paid plans return a checkout session URL.

• New Features
  • Gateway layer: SubscriptionCheckoutGateway with CashierSubscriptionCheckoutGateway (uses laravel/cashier) and FakeSubscriptionCheckoutGateway for tests.
  • BillingPaymentService::createSubscriptionCheckout validates paid plans and returns CheckoutSessionDto.
  • Throws CannotCheckoutFreePlanException for free plan attempts.
  • Binds SubscriptionCheckoutGateway → CashierSubscriptionCheckoutGateway in AppServiceProvider; tests cover paid and free flows without real Stripe calls.

^{Written for commit 54ce5eb. 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-243-test-billing-payment-service-creates-subscription-checkout

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