CONV-257: Create CreditPack enum

[menvil]

Summary

• Adds App\Enums\Billing\CreditPack backed string enum with Small, Medium, Large cases
• No Stripe-specific logic in the enum
• Unit test confirms all three case values

Test plan

• tests/Unit/Billing/CreditPackEnumTest.php — verifies small, medium, large values
• composer test passes (460 tests)
• composer lint passes

🤖 Generated with Claude Code

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Summary by cubic

Implements CONV-257 by adding App\Enums\Billing\CreditPack (string-backed) with Small, Medium, Large cases, standardizing keys to small, medium, large.
Includes a unit test to verify these values.

^{Written for commit acb6800. 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-257-create-credit-pack-enum

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