web-next: herramientas de PD (transferir, comercio, códigos de promoción)

- /transfer-d-points: transferir PD a la cuenta dueña de un personaje
  (requiere token de seguridad; movimiento atómico con FOR UPDATE).
- /trade-points: comercio PD<->oro mediante códigos de 1 solo uso
  (contraseña + token + Turnstile; oro al creador por SOAP; expira 1h;
  lock de 5s tras canjear; rollback total si falla la entrega).
- /promo-code: canje de códigos por PD/PV (sensibles a mayúsculas/minúsculas,
  usos limitados, 1 canje por cuenta).
- /admin/promo: panel para crear / editar / activar / desactivar / borrar
  códigos de promoción.
- Tablas nuevas (sql/): home_tradecode, home_promocode, home_promoredemption.

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

web-next/messages/en.json

@@ -482,7 +482,21 @@
     "show": "Show",
     "hide": "Hide",
     "categoryNotEmpty": "Category has forums; delete them first.",
-    "backToPanel": "← Back to panel"
+    "backToPanel": "← Back to panel",
+    "managePromo": "Manage promo codes",
+    "promo": "Promo codes",
+    "createPromo": "Create code",
+    "promoCode": "Code",
+    "promoPd": "PD",
+    "promoPv": "PV",
+    "promoMaxUses": "Max uses",
+    "promoExpires": "Expires (optional)",
+    "promoActive": "Active",
+    "promoUses": "Uses",
+    "promoRedemptions": "Redemptions",
+    "noPromo": "No promo codes.",
+    "promoDuplicate": "A code with that text already exists.",
+    "promoEmptyError": "Enter the code and at least PD or PV (with max uses ≥ 1)."
   },
   "Vote": {
     "title": "Vote for us",