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>

scripts/generate-images.mjs

@@ -1,67 +0,0 @@
-import sharp from 'sharp'
-import { readFileSync } from 'fs'
-import { resolve, dirname } from 'path'
-import { fileURLToPath } from 'url'
-
-const __dirname = dirname(fileURLToPath(import.meta.url))
-const publicDir = resolve(__dirname, '../public')
-
-// og-image: SVG → PNG 1200×630
-const svgBuffer = readFileSync(resolve(publicDir, 'og-image.svg'))
-await sharp(svgBuffer)
-  .resize(1200, 630)
-  .png({ quality: 90 })
-  .toFile(resolve(publicDir, 'og-image.png'))
-console.log('✓ og-image.png (1200×630)')
-
-// apple-touch-icon: logo.png → 180×180
-await sharp(resolve(publicDir, 'logo.png'))
-  .resize(180, 180, { fit: 'contain', background: { r: 255, g: 255, b: 255, alpha: 1 } })
-  .png()
-  .toFile(resolve(publicDir, 'apple-touch-icon.png'))
-console.log('✓ apple-touch-icon.png (180×180)')
-
-// favicon.ico: logo.png → multi-size ICO (16, 32, 48)
-import { writeFileSync } from 'fs'
-
-const icoSizes = [16, 32, 48]
-const pngBuffers = await Promise.all(
-  icoSizes.map(size =>
-    sharp(resolve(publicDir, 'logo.png'))
-      .resize(size, size, { fit: 'contain', background: { r: 0, g: 0, b: 0, alpha: 0 } })
-      .png()
-      .toBuffer()
-  )
-)
-
-// Build ICO: header + directory + image data
-const count = icoSizes.length
-const headerSize = 6
-const dirEntrySize = 16
-const dirSize = count * dirEntrySize
-let offset = headerSize + dirSize
-
-const header = Buffer.alloc(headerSize)
-header.writeUInt16LE(0, 0)     // reserved
-header.writeUInt16LE(1, 2)     // type: 1 = ICO
-header.writeUInt16LE(count, 4)
-
-const dirs = []
-for (let i = 0; i < count; i++) {
-  const dir = Buffer.alloc(dirEntrySize)
-  const size = icoSizes[i]
-  dir.writeUInt8(size === 256 ? 0 : size, 0)   // width
-  dir.writeUInt8(size === 256 ? 0 : size, 1)   // height
-  dir.writeUInt8(0, 2)   // color count
-  dir.writeUInt8(0, 3)   // reserved
-  dir.writeUInt16LE(1, 4)   // color planes
-  dir.writeUInt16LE(32, 6)  // bits per pixel
-  dir.writeUInt32LE(pngBuffers[i].length, 8)
-  dir.writeUInt32LE(offset, 12)
-  offset += pngBuffers[i].length
-  dirs.push(dir)
-}
-
-const ico = Buffer.concat([header, ...dirs, ...pngBuffers])
-writeFileSync(resolve(publicDir, 'favicon.ico'), ico)
-console.log('✓ favicon.ico (16×16, 32×32, 48×48)')

scripts/prerender.mjs

@@ -1,34 +0,0 @@
-import { readFileSync, writeFileSync, rmSync, readdirSync } from 'fs'
-import { resolve, dirname } from 'path'
-import { fileURLToPath } from 'url'
-
-const __dirname = dirname(fileURLToPath(import.meta.url))
-const root = resolve(__dirname, '..')
-const buildDir = process.env.BUILD_DIR || 'dist'
-
-// Import SSR bundle (always built to dist/server inside project)
-const { render } = await import('../dist/server/entry-server.js')
-
-let html = readFileSync(resolve(root, buildDir, 'index.html'), 'utf-8')
-
-// Inject prerendered HTML
-const appHtml = render()
-html = html.replace('<div id="root"></div>', `<div id="root">${appHtml}</div>`)
-
-// Fix preload font: find actual cyrillic-700 woff2 hash in dist/assets
-const assetsDir = resolve(root, buildDir, 'assets')
-const fontFile = readdirSync(assetsDir).find(f => f.match(/manrope-cyrillic-700-normal-.+\.woff2/))
-if (fontFile) {
-  html = html.replace(
-    /href="\/assets\/manrope-cyrillic-700-normal-[^"]+\.woff2"/,
-    `href="/assets/${fontFile}"`
-  )
-  console.log(`✓ Preload font updated: ${fontFile}`)
-}
-
-writeFileSync(resolve(root, buildDir, 'index.html'), html)
-
-// Cleanup SSR bundle
-rmSync(resolve(root, 'dist/server'), { recursive: true, force: true })
-
-console.log('✓ Prerendered index.html')