Login end-to-end en Next.js: iron-session + auth SRP6 + página i18n

- lib/session.ts: sesión cifrada httpOnly con iron-session (SESSION_SECRET en
  .env.local). SessionData {bnetId, bnetEmail, username, accountId}.
- lib/auth.ts: authenticate(email,password) verifica contra battlenet_accounts con
  bnetVerify (SRP6 v2); getGameAccounts(bnetId). Resiliente si acore no está.
- app/api/auth/login/route.ts: POST -> autentica, fija sesión, resuelve cuentas de
  juego (1 -> auto; 0/varias -> needsSelection). Devuelve JSON.
- app/[locale]/login: página SSR + LoginForm (cliente, next-intl, router i18n).
  Textos en messages/*.json (namespace Login).
- tsconfig target ES2020 (literales BigInt de bnet.ts).

Validado end-to-end: con una cuenta creada por bnet.py (como haría AzerothCore),
el login TS la verifica OK y emite la cookie de sesión; password incorrecta ->
invalidCredentials; sin campos -> missingFields. Página en ES y EN.

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

web-next/package-lock.json

@@ -8,6 +8,7 @@
       "name": "web-next",
       "version": "0.1.0",
       "dependencies": {
+        "iron-session": "^8.0.4",
         "mysql2": "^3.22.6",
         "next": "16.2.10",
         "next-intl": "^4.13.2",
@@ -3506,6 +3507,14 @@
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       "dev": true
     },
+    "node_modules/cookie": {
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+      "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.7.2.tgz",
+      "integrity": "sha512-yki5XnKuf750l50uGTllt6kKILY4nQ1eNIQatoXEByZ5dWgnKqbnqmTrBE5B4N7lrMJKQ2ytWMiTO2o0v6Ew/w==",
+      "engines": {
+        "node": ">= 0.6"
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     "node_modules/cross-spawn": {
       "version": "7.0.6",
       "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.6.tgz",
@@ -4867,6 +4876,28 @@
         "@formatjs/icu-messageformat-parser": "3.5.14"
       }
     },
+    "node_modules/iron-session": {
+      "version": "8.0.4",
+      "resolved": "https://registry.npmjs.org/iron-session/-/iron-session-8.0.4.tgz",
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+      "funding": [
+        "https://github.com/sponsors/vvo",
+        "https://github.com/sponsors/brc-dd"
+      ],
+      "dependencies": {
+        "cookie": "^0.7.2",
+        "iron-webcrypto": "^1.2.1",
+        "uncrypto": "^0.1.3"
+      }
+    },
+    "node_modules/iron-webcrypto": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/iron-webcrypto/-/iron-webcrypto-1.2.1.tgz",
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+      "funding": {
+        "url": "https://github.com/sponsors/brc-dd"
+      }
+    },
     "node_modules/is-array-buffer": {
       "version": "3.0.5",
       "resolved": "https://registry.npmjs.org/is-array-buffer/-/is-array-buffer-3.0.5.tgz",
@@ -7279,6 +7310,11 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/uncrypto": {
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+      "resolved": "https://registry.npmjs.org/uncrypto/-/uncrypto-0.1.3.tgz",
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+    },
     "node_modules/undici-types": {
       "version": "6.21.0",
       "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-6.21.0.tgz",