Generaliza los servicios de personaje de pago (5) con infra común

- lib/paid-services.ts: config PAID_SERVICES (rename/customize/change-race/
  change-faction/level-up) con comando SOAP, precio y productName por servicio.
- app/api/character/[service]/checkout: ruta de checkout GENÉRICA (valida servicio +
  personaje, crea la sesión Stripe con successUrl /service-success?service=...).
- app/[locale]/service-success: página de éxito ÚNICA que verifica el pago
  (claimPaidCheckout) y ejecuta el comando SOAP del servicio.
- components/ServicePageContent: contenido común (guardas + PaidServiceForm).
- 5 páginas mínimas /rename /customize /change-race /change-faction /level-up.
- Catálogo Paid (por servicio: title/pay/success) sustituye a Rename.

Verificado: 5 páginas redirigen a login, checkout 401 sin sesión, servicio inválido
404, service-success con pago inválido no entrega (muestra error). Pendiente: gold
(cantidad) y transfer (destino+token), variantes del patrón.

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

web-next/app/api/character/[service]/checkout/route.ts

@@ -0,0 +1,45 @@
+import { getSession } from '@/lib/session'
+import { getGameCharacters } from '@/lib/characters'
+import { createCheckoutSession } from '@/lib/stripe'
+import { getPaidService } from '@/lib/paid-services'
+
+export async function POST(request: Request, { params }: { params: Promise<{ service: string }> }) {
+  const { service } = await params
+  const cfg = getPaidService(service)
+  if (!cfg) return Response.json({ success: false, error: 'invalidService' }, { status: 404 })
+
+  const session = await getSession()
+  if (!session.accountId) return Response.json({ success: false, error: 'notAuthenticated' }, { status: 401 })
+
+  let character = ''
+  try {
+    const body = await request.json()
+    character = String(body.character ?? '')
+  } catch {
+    return Response.json({ success: false, error: 'invalidRequest' }, { status: 400 })
+  }
+  if (!character) return Response.json({ success: false, error: 'invalidCharacter' })
+
+  const chars = await getGameCharacters(session.accountId)
+  if (!chars.find((c) => c.name === character)) {
+    return Response.json({ success: false, error: 'invalidCharacter' })
+  }
+
+  const price = await cfg.getPrice()
+  const site = process.env.SITE_URL || ''
+  const ip = (request.headers.get('x-forwarded-for') || '').split(',')[0].trim() || '0.0.0.0'
+
+  const r = await createCheckoutSession({
+    accountId: session.accountId,
+    username: session.username || '',
+    email: session.bnetEmail || '',
+    acoreIp: ip,
+    amount: price,
+    characterName: character,
+    productName: cfg.productName(character),
+    successUrl: `${site}/service-success?service=${service}`,
+    cancelUrl: `${site}/${service}`,
+  })
+  if (!r.success || !r.url) return Response.json({ success: false, error: 'stripeError' })
+  return Response.json({ success: true, url: r.url })
+}