feat(subscriptions): Add PayPal integration for SaaS (Fase 3) v1.50.0
Backend:
- PayPalService with OAuth2, subscriptions, webhooks
- SubscriptionController with status, subscribe, confirm, cancel, invoices
- Webhook handlers for PayPal events (activated, cancelled, expired, payment)
- Config for PayPal credentials
Frontend:
- Pricing.jsx: Plans page with cards, FAQ, trust badges
- Billing.jsx: Subscription management, invoices list, cancel modal
- Added routes /pricing (public) and /billing (auth)
- Navigation links in Settings menu
Translations:
- pricing.* and billing.* keys in ES, PT-BR, EN
- nav.pricing, nav.billing
Ready for PayPal Sandbox testing once credentials are configured.
679a1bc4b2