CONV-260: Create CreditPackRepository

[menvil]

Summary

• Adds App\Services\Billing\CreditPackRepository reading from config('billing.credit_packs')
• Methods: all(), find(), findOrFail(), findByStripePriceId()
• findOrFail() throws InvalidArgumentException for unknown keys
• Makes CreditPackDto::stripePriceId nullable (matches BillingPlanDto pattern; env not set in tests)

Test plan

• tests/Unit/Billing/CreditPackRepositoryTest.php — all(), findOrFail(), unknown key, findByStripePriceId(), null for unknown price id
• composer test passes (468 tests)
• composer lint passes

🤖 Generated with Claude Code

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Summary by cubic

Implements CreditPackRepository to list and look up credit packs from config('billing.credit_packs'), including lookup by Stripe price ID. Fulfills CONV-260 by providing a simple API for one-off credit purchases.

• New Features
  • Added App\Services\Billing\CreditPackRepository with all(), find(), findOrFail() (throws InvalidArgumentException), and findByStripePriceId().
  • Updated App\Data\Billing\CreditPackDto to make stripePriceId nullable.

^{Written for commit 1eb7434. 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-260-create-credit-pack-repository

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