Token de seguridad y cambio de contraseña (páginas protegidas)

- lib/security-token.ts: requestSecurityToken (token de 6 chars, cooldown 7 días,
  guarda en home_securitytoken, email) + checkSecurityToken.
- lib/change-password.ts: changePassword (valida token + contraseña actual con
  authenticate, re-deriva verifier SRP6 v2, actualiza battlenet_accounts).
- Routes /api/account/security-token y /change-password (guard; el cambio hace
  logout de la sesión). Páginas /security-token y /change-password (protegidas) con
  sus forms cliente e i18n (SecurityToken, ChangePassword).

Verificado: páginas redirigen a login sin sesión, APIs 401. Reutiliza
home_securitytoken de Django y la crypto validada.

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

web-next/app/[locale]/security-token/page.tsx

@@ -0,0 +1,35 @@
+import type { RowDataPacket } from 'mysql2'
+import { getTranslations, setRequestLocale } from 'next-intl/server'
+import { redirect } from '@/i18n/navigation'
+import { getSession } from '@/lib/session'
+import { db, DB } from '@/lib/db'
+import { SecurityTokenForm } from './SecurityTokenForm'
+
+export const dynamic = 'force-dynamic'
+
+export default async function SecurityTokenPage({ params }: { params: Promise<{ locale: string }> }) {
+  const { locale } = await params
+  setRequestLocale(locale)
+  const t = await getTranslations('SecurityToken')
+  const session = await getSession()
+  if (!session.bnetId) redirect({ href: '/login', locale })
+  if (!session.username) redirect({ href: '/select-account', locale })
+
+  let tokenDate: string | null = null
+  try {
+    const [rows] = await db(DB.default).query<RowDataPacket[]>(
+      'SELECT created_at FROM home_securitytoken WHERE user_id = ? ORDER BY created_at DESC LIMIT 1',
+      [session.accountId ?? 0],
+    )
+    if (rows[0]) tokenDate = new Date(rows[0].created_at).toISOString()
+  } catch {
+    /* ignore */
+  }
+
+  return (
+    <main className="mx-auto max-w-3xl px-4 py-8">
+      <h1 className="mb-6 text-center text-2xl font-bold text-amber-500">{t('title')}</h1>
+      <SecurityTokenForm initialDate={tokenDate} />
+    </main>
+  )
+}