CONV-240: Create billing plans config

[menvil]

Summary

• Created config/billing_plans.php with free (50 credits), pro (1000 credits), max (5000 credits) plan definitions
• Paid plans reference Stripe price IDs via env vars with test fallbacks
• Added STRIPE_PRO_PRICE_ID and STRIPE_MAX_PRICE_ID placeholders to .env.example
• Config tests verify all three plans exist and paid plans have price IDs

Test plan

• composer test passes (430 tests)
• composer lint passes

🤖 Generated with Claude Code

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Summary by cubic

Adds a central billing plans config with Free, Pro, and Max plans, monthly credits, and Stripe price IDs to support subscription setup (CONV-240). Adds .env placeholders for paid plan price IDs and tests to validate the config.

• Migration
  • Set STRIPE_PRO_PRICE_ID and STRIPE_MAX_PRICE_ID in .env for production; dev/test use price_test_pro and price_test_max by default.

^{Written for commit b9d72d4. 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-240-create-billing-plans-config

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