Central API server for webhooks and server-side operations.
POST /api/stripe/webhook - Stripe webhook handlerPOST /api/stripe/create-checkout-session - Create checkout sessionPOST /api/stripe/create-portal-session - Create billing portalGET /api/subscription/status - Check subscription statusGET /api/subscription/plans - Get subscription plansGET /api/app/config - Get app configuration