feat(rpayments): extract QR payment app from rCart into its own rApp
- New modules/rpayments/ with routes, schemas, components, landing, recurring-executor
- Doc ID pattern {space}:payments:{paymentId}; one-time migration from {space}:cart:payments:*
- Cross-module hook onPaymentPaid() — rCart registers handler in onInit to auto-record
contributions on linked shopping carts when a contribute-pay payment settles
- rCart: drop all /api/payments/*, /payments, /request, /pay/:id, /subscriptions, email
scheduler, and the inline payments tab in folk-cart-shop; contribute-pay now mints
via imported rpayments schemas and returns /rpayments/pay/ links
- server/index.ts: register paymentsModule, flip public-endpoint matcher to /rpayments
- Display: rPayments (💳) added to module-display, rstack-app-switcher (Commerce),
rstack-tab-bar (Funding & Commerce), e2e/fixtures/module-list
- Vite: 3 payment component build entries + payments.css repointed to modules/rpayments