feat: Add Stripe payment integration and subscription management
- Add Stripe.net SDK for payment processing
- Implement StripeService with checkout sessions, customer portal, webhooks
- Implement SubscriptionService for quota management
- Add quota enforcement to CVCheckService
- Create Pricing, Billing, Settings pages
- Add checkout success/cancel pages
- Update Check and Dashboard with usage indicators
- Add ResetMonthlyUsageJob for billing cycle resets
- Add database migration for subscription fields
Plan tiers: Free (3 checks), Professional £49/mo (30), Enterprise £199/mo (unlimited)
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Peter Foster
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