Registro + activación por email en Next.js (SRP6 + nodemailer)

- lib/mail.ts: transporte SMTP (nodemailer, mismas creds Gmail que Django).
- lib/register.ts: registerAccount (valida, comprueba email existente, crea fila en
  home_accountactivation reutilizando la tabla de Django, envía email de activación);
  activateAccount (crea battlenet_accounts con SRP6 v2 + account con SRP6 Grunt, como
  activate_account_view: expansion=2, battlenet_index=1; borra la activación).
- Route handlers /api/auth/register y /api/auth/activate.
- Páginas app/[locale]/register (RegisterForm cliente) y app/[locale]/activate-account
  (ActivateClient auto-POST al abrir el enlace). Textos en messages (Register, Activate).

Validado: validaciones (missingFields/passwordMismatch/invalidEmail/passwordTooLong);
ciclo completo activación->crea bnet+account->login OK con la cuenta creada
(needsSelection=false), password mala->invalidCredentials. Todo en TS, crypto validada.

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

web-next/package-lock.json

@@ -12,12 +12,14 @@
         "mysql2": "^3.22.6",
         "next": "16.2.10",
         "next-intl": "^4.13.2",
+        "nodemailer": "^9.0.3",
         "react": "19.2.4",
         "react-dom": "19.2.4"
       },
       "devDependencies": {
         "@tailwindcss/postcss": "^4.3.2",
         "@types/node": "^20",
+        "@types/nodemailer": "^8.0.1",
         "@types/react": "^19",
         "@types/react-dom": "^19",
         "eslint": "^9",
@@ -2436,6 +2438,15 @@
         "undici-types": "~6.21.0"
       }
     },
+    "node_modules/@types/nodemailer": {
+      "version": "8.0.1",
+      "resolved": "https://registry.npmjs.org/@types/nodemailer/-/nodemailer-8.0.1.tgz",
+      "integrity": "sha512-PxpaInm8V1JQDd4j0ds5HfvWQk8JupS1C0Picb96QJsrrRDjBH+DlK7L4ZdNSqNULhiZRQHc40nLVShaGxXAMw==",
+      "dev": true,
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
     "node_modules/@types/react": {
       "version": "19.2.17",
       "resolved": "https://registry.npmjs.org/@types/react/-/react-19.2.17.tgz",
@@ -6090,6 +6101,14 @@
         "node": ">=18"
       }
     },
+    "node_modules/nodemailer": {
+      "version": "9.0.3",
+      "resolved": "https://registry.npmjs.org/nodemailer/-/nodemailer-9.0.3.tgz",
+      "integrity": "sha512-n+YP+NKwR5zRWa60k3GiQ6Q3B4KXCoAw40dAKeCtYn020iNN74aWK2liXIC3ZEATeGql7we3tE3t8QwhY0eskw==",
+      "engines": {
+        "node": ">=6.0.0"
+      }
+    },
     "node_modules/object-assign": {
       "version": "4.1.1",
       "resolved": "https://registry.npmjs.org/object-assign/-/object-assign-4.1.1.tgz",