CONV-265: Create CreditPackWebhookHandler skeleton

[menvil]

Summary

• Adds App\Billing\Webhooks\CreditPackWebhookHandler with handleCheckoutSessionCompleted() stub
• Stub throws LogicException('Not implemented yet.') — grant logic comes in CONV-267
• Handler is resolvable from container

Test plan

• tests/Unit/Billing/CreditPackWebhookHandlerSkeletonTest.php — handler exists and method exists
• composer test passes (478 tests)
• composer lint passes

🤖 Generated with Claude Code

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Summary by cubic

Adds the CreditPackWebhookHandler skeleton per CONV-265 to prepare for handling credit pack checkout webhooks. Exposes handleCheckoutSessionCompleted() (throws LogicException for now) and adds a unit test to confirm the handler resolves from the container and the method exists.

^{Written for commit 7078fea. 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-265-create-credit-pack-webhook-handler-skeleton

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