Añadir /send-gift (Enviar regalo) pagado por SumUp

Envía ítems de la tienda por correo al personaje de un amigo, pagado por
SumUp. lib/gift.ts (catálogo por categoría, priceCart con precios reales de
BD, sendGiftByMail vía SOAP .send items troceado a 12/correo + anti-inyección);
servicio send-gift en PAID_SERVICES; ruta dedicada /api/gift/checkout (origen
propio, destino existe, token de seguridad, carrito); SendGiftForm + página con
el diseño; i18n Paid[send-gift]; seed_giftitems.sql (4 cat, 8 ítems).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web-next/messages/en.json

@@ -341,7 +341,11 @@
       "destination": "Destination account",
       "success": "Character {name} has been transferred to the destination account."
     },
-    "alreadyProcessed": "Your payment is confirmed and the reward was already delivered."
+    "alreadyProcessed": "Your payment is confirmed and the reward was already delivered.",
+    "send-gift": {
+      "title": "Send gift",
+      "success": "The gift has been mailed to character {name}."
+    }
   },
   "SecurityToken": {
     "title": "Security token",
@@ -690,4 +694,4 @@
     "title": "Page not found",
     "message": "It looks like the page you are looking for doesn't exist or isn't available."
   }
-}
+}