CONV-237: Publish Cashier migrations and add Billable trait

[menvil]

Summary

• Published Cashier migrations (customer columns, subscriptions, subscription items tables)
• Added Billable trait to User model
• Added unit test verifying User uses Billable
• Existing plan/credits logic unaffected (426 tests pass)

Test plan

• composer test passes (426 tests)
• composer lint passes
• php artisan migrate completes successfully

🤖 Generated with Claude Code

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Summary by cubic

Enables Stripe billing via laravel/cashier by adding Billable to User and publishing the required migrations. Prepares subscriptions and usage metering without changing existing plan/credits logic (CONV-237).

• New Features

  • Added Laravel\Cashier\Billable to User.
  • Published Cashier migrations: customer columns on users, subscriptions, subscription_items, plus meter_id and meter_event_name for usage-based billing.
  • Added a unit test to confirm User uses Billable.

• Migration

  • Run: php artisan migrate

^{Written for commit 0833322. 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-237-publish-cashier-migrations-and-add-billable-trait

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