CONV-239: Create BillingPlan enum

[menvil]

Summary

• App\Enums\Plan already exists with Free, Pro, Max cases from Phase 13 — no duplicate created
• Added unit test verifying all three plan values (free, pro, max)
• Billing classes in subsequent tasks will import App\Enums\Plan directly

Test plan

• composer test passes (428 tests)
• composer lint passes

🤖 Generated with Claude Code

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Summary by cubic

Reuses the existing App\Enums\Plan for billing (Free, Pro, Max) and adds a unit test to lock in the free/pro/max values, satisfying CONV-239.

^{Written for commit c180834. Summary will update on new commits.}

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• Commit unit tests in branch feature/CONV-239-create-billing-plan-enum

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