CONV-236: Install Laravel Cashier Stripe

[menvil]

Summary

• Installs laravel/cashier v16.5.3 (with stripe/stripe-php v17.x and moneyphp/money)
• App bootstraps correctly, no Cashier usage in application code yet
• Migrations and Billable trait deferred to CONV-237

Test plan

• composer test passes (425 tests)
• composer lint passes
• php artisan about boots without errors

🤖 Generated with Claude Code

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Summary by cubic

Installs laravel/cashier to prepare Stripe billing per CONV-236. Adds dependencies only; app boots cleanly with no Cashier usage yet.

• Dependencies
  • Added laravel/cashier v16.5.x
  • Brings in stripe/stripe-php v17.x, moneyphp/money, and symfony/polyfill-intl-icu

^{Written for commit 3187d29. 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-236-install-laravel-cashier-stripe

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