seo: GA4, breadcrumbs JSON-LD, IndexNow post-deploy, llms.txt

- Add GA4 (G-C9J0D8FFH3) to root layout alongside Yandex.Metrika
- Add BreadcrumbList JSON-LD schema to all inner pages
- Add scripts/indexnow.mjs — submits 30 URLs to IndexNow + Yandex on deploy
- Add indexnow to postdeploy step in package.json
- Update llms.txt with all 8 services and new pages (about/clients/partners)

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

src/app/layout.tsx

@@ -24,6 +24,14 @@ export default function RootLayout({ children }: { children: React.ReactNode })
         <link rel="icon" type="image/svg+xml" href="/favicon.svg" />
         <link rel="apple-touch-icon" href="/apple-touch-icon.png" />
         <Script src="https://challenges.cloudflare.com/turnstile/v0/api.js" strategy="lazyOnload" />
+        {/* Google Analytics GA4 */}
+        <Script src="https://www.googletagmanager.com/gtag/js?id=G-C9J0D8FFH3" strategy="afterInteractive" />
+        <Script id="ga4" strategy="afterInteractive">{`
+          window.dataLayer = window.dataLayer || [];
+          function gtag(){dataLayer.push(arguments);}
+          gtag('js', new Date());
+          gtag('config', 'G-C9J0D8FFH3');
+        `}</Script>
         {/* Yandex.Metrika */}
         <Script id="ym" strategy="afterInteractive">{`
           (function(m,e,t,r,i,k,a){m[i]=m[i]||function(){(m[i].a=m[i].a||[]).push(arguments)};