store: pagar también con Stripe y SumUp (tarjeta), además del saldo PD/PV

Selector de forma de pago en el carrito (Saldo PD/PV · Stripe · SumUp), como el
resto de servicios. Con tarjeta, el carrito se convierte a euros (100 PD = 1 €,
200 PV = 1 €), se guarda como pedido y se entrega tras confirmarse el pago.

- BD: tabla home_store_order (ref, cuenta, personaje, items, importe) para no
  depender del límite de metadata de la pasarela (sql/home_store_order.sql).
- lib/store: storeEuroTotal, createStoreOrder, fulfillStoreOrder.
- paid-services: servicio 'store' (fulfill = enviar el pedido por order_ref);
  la entrega la dispara service-success/reconciliación/webhook como los demás.
- /api/store/send: rama provider stripe/sumup (crea pedido + checkout, mínimo
  1 €/0,50 €) además del pago con saldo.
- StoreBrowser: selector Saldo/Stripe/SumUp; con tarjeta redirige a la pasarela.
- i18n Store (payMethod/payBalance/payStripe/paySumUp/confirmCard/amountTooLow)
  y Paid.store (title/success). Verificado: euros 200PD+28PV=2,14 €, pedido y
  fulfill por order_ref (SOAP real pendiente, worldserver caído).

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

web-next/messages/en.json

@@ -364,6 +364,11 @@
       "title": "Rename guild",
       "pay": "Rename for {price} €",
       "success": "The guild has been renamed to \"{name}\". Online members may need to reconnect to see it."
+    },
+    "store": {
+      "title": "Store",
+      "pay": "Buy for {price} €",
+      "success": "Items sent to character {name}! Check your in-game mail."
     }
   },
   "SecurityToken": {
@@ -1955,10 +1960,17 @@
       "deliveryFailed": "The items could not be sent (game server unavailable). Your balance has been refunded.",
       "invalidCharacter": "Invalid character.",
       "emptyCart": "Your cart is empty.",
-      "generic": "An error occurred. Please try again."
+      "generic": "An error occurred. Please try again.",
+      "amountTooLow": "The minimum amount to pay by card is {min} €."
     },
     "newsTitle": "News",
     "newsIntro": "List of additions made based on the community's suggestions in our forum.",
-    "newsDate": "November 2024"
+    "newsDate": "November 2024",
+    "payMethod": "Payment method",
+    "payBalance": "PD/VP balance",
+    "payStripe": "Card (Stripe)",
+    "paySumUp": "Card (SumUp)",
+    "confirmCard": "Pay {eur} € by card and send the items to {character}?",
+    "amountTooLow": "The minimum amount to pay by card is {min} €."
   }
 }