feat: migrate to Next.js 15 App Router with i18n and multi-page SEO

- Replace Vite+React SPA with Next.js 15, TypeScript, App Router
- Static export (output: 'export'), deploy via npm run deploy
- i18n routing: /ru/... and /en/... with generateStaticParams
- New pages: /uslugi/ (catalog), /uslugi/[slug]/ (8 service pages), /faq/, /kontakty/
- SEO: generateMetadata on all pages, JSON-LD Service schema, hreflang alternates
- ContactForm: 'use client', Turnstile + POST to /api/contact.php
- Fonts: Manrope via next/font/google (CSS variable)
- Remove: vite.config.js, entry-server.jsx, prerender scripts, LanguageContext

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/[lang]/uslugi/[slug]/page.tsx

@@ -0,0 +1,125 @@
+import type { Metadata } from 'next'
+import Link from 'next/link'
+import { notFound } from 'next/navigation'
+import { getDictionary, LOCALES, type Locale } from '@/lib/i18n'
+import { SERVICE_SLUGS } from '@/lib/services'
+import { Server, Shield, Headphones, Camera, Network, HardDrive, Phone, Cloud, CheckCircle2, ChevronRight } from 'lucide-react'
+
+const ICONS = [Server, Shield, Headphones, Camera, Network, HardDrive, Phone, Cloud]
+
+export function generateStaticParams() {
+  return LOCALES.flatMap(lang =>
+    SERVICE_SLUGS.map(slug => ({ lang, slug }))
+  )
+}
+
+export async function generateMetadata({ params }: { params: Promise<{ lang: string; slug: string }> }): Promise<Metadata> {
+  const { lang, slug } = await params
+  const d = getDictionary(lang)
+  const svc = d.services.items.find(s => s.slug === slug)
+  if (!svc) return {}
+  return {
+    title: svc.title,
+    description: svc.description,
+    alternates: {
+      canonical: `https://sag24.ru/${lang}/uslugi/${slug}/`,
+      languages: {
+        'ru': `https://sag24.ru/ru/uslugi/${slug}/`,
+        'en': `https://sag24.ru/en/uslugi/${slug}/`,
+      },
+    },
+    openGraph: {
+      title: `${svc.title} | Сисадмингрупп`,
+      description: svc.description,
+      images: [{ url: '/og-image.png' }],
+    },
+  }
+}
+
+export default async function ServicePage({ params }: { params: Promise<{ lang: string; slug: string }> }) {
+  const { lang: langStr, slug } = await params
+  const lang = langStr as Locale
+  const d = getDictionary(lang)
+  const idx = d.services.items.findIndex(s => s.slug === slug)
+  if (idx === -1) notFound()
+  const svc = d.services.items[idx]
+  const Icon = ICONS[idx]
+
+  return (
+    <div className="pt-16">
+      <section className="py-24 bg-gradient-to-br from-slate-900 via-blue-950 to-slate-900">
+        <div className="max-w-4xl mx-auto px-4 sm:px-6 text-center">
+          <div className="w-16 h-16 bg-blue-500/20 rounded-2xl flex items-center justify-center mx-auto mb-6">
+            <Icon size={32} className="text-blue-400" />
+          </div>
+          <h1 className="text-4xl sm:text-5xl font-bold text-white mb-6">{svc.title}</h1>
+          <p className="text-xl text-slate-300 max-w-2xl mx-auto mb-10">{svc.description}</p>
+          <Link href={`/${lang}/kontakty/`}
+            className="inline-flex items-center gap-2 px-8 py-4 bg-blue-600 hover:bg-blue-500 text-white font-semibold rounded-lg transition-colors">
+            {lang === 'ru' ? 'Обсудить проект' : 'Discuss project'}
+            <ChevronRight size={20} />
+          </Link>
+        </div>
+      </section>
+
+      <section className="py-16 bg-white">
+        <div className="max-w-4xl mx-auto px-4 sm:px-6">
+          <h2 className="text-2xl font-bold text-slate-900 mb-8">
+            {lang === 'ru' ? 'Что включено' : 'What is included'}
+          </h2>
+          <ul className="grid md:grid-cols-2 gap-4">
+            {svc.points.map((point, i) => (
+              <li key={i} className="flex items-start gap-3 p-4 bg-slate-50 rounded-lg border border-slate-100">
+                <CheckCircle2 size={20} className="text-blue-600 flex-shrink-0 mt-0.5" />
+                <span className="text-slate-700">{point}</span>
+              </li>
+            ))}
+          </ul>
+        </div>
+      </section>
+
+      <section className="py-16 bg-slate-50 border-t border-slate-100">
+        <div className="max-w-4xl mx-auto px-4 sm:px-6 text-center">
+          <h2 className="text-2xl font-bold text-slate-900 mb-4">
+            {lang === 'ru' ? 'Нужна консультация?' : 'Need a consultation?'}
+          </h2>
+          <p className="text-slate-600 mb-8">
+            {lang === 'ru' ? 'Свяжитесь с нами — обсудим детали и рассчитаем стоимость.' : 'Contact us — we will discuss details and calculate the cost.'}
+          </p>
+          <div className="flex flex-col sm:flex-row gap-4 justify-center">
+            <a href="tel:+74953637476" className="px-6 py-3 bg-blue-600 hover:bg-blue-500 text-white font-semibold rounded-lg transition-colors">
+              +7 495 363-74-76
+            </a>
+            <Link href={`/${lang}/kontakty/`}
+              className="px-6 py-3 border border-slate-300 hover:border-blue-300 text-slate-700 font-semibold rounded-lg transition-colors">
+              {lang === 'ru' ? 'Написать нам' : 'Write to us'}
+            </Link>
+          </div>
+        </div>
+      </section>
+
+      <div className="max-w-4xl mx-auto px-4 sm:px-6 py-8">
+        <Link href={`/${lang}/uslugi/`} className="text-blue-600 hover:text-blue-800 text-sm font-medium">
+          ← {lang === 'ru' ? 'Все услуги' : 'All services'}
+        </Link>
+      </div>
+
+      <script
+        type="application/ld+json"
+        dangerouslySetInnerHTML={{
+          __html: JSON.stringify({
+            '@context': 'https://schema.org',
+            '@type': 'Service',
+            'name': svc.title,
+            'description': svc.description,
+            'provider': {
+              '@type': 'Organization',
+              'name': 'Сисадмингрупп',
+              'url': 'https://sag24.ru',
+            },
+          }),
+        }}
+      />
+    </div>
+  )
+}