feat: add sitemap.xml, robots.txt, full SEO metadata

app/[locale]/layout.tsx

@@ -20,9 +20,47 @@ const jetbrainsMono = JetBrains_Mono({
   weight: ["400", "500", "600", "700"],
 });
 
+const BASE_URL = 'https://ayrisai.xyz';
+
 export const metadata: Metadata = {
-  title: "DevHub YouTube | Educational Code & Resource Portal",
-  description: "Official resource portal featuring tabbed code snippets, lesson notes, starter packs, and project downloads for my YouTube tutorials.",
+  metadataBase: new URL(BASE_URL),
+  title: {
+    default: 'ayris.tech YouTube | Code & Resource Portal',
+    template: '%s | ayris.tech YouTube',
+  },
+  description:
+    'Official resource portal for the ayris.tech YouTube channel. Browse source code, lesson notes, cheatsheets, AI prompts, and project downloads for every tutorial.',
+  keywords: [
+    'Next.js', 'React', 'TypeScript', 'Tailwind CSS', 'Python',
+    'YouTube tutorial', 'source code', 'ayris.tech', 'web development',
+    'AI agents', 'Prisma', 'Docker', 'full-stack',
+  ],
+  authors: [{ name: 'ayris.tech', url: BASE_URL }],
+  creator: 'ayris.tech',
+  openGraph: {
+    type: 'website',
+    locale: 'en_US',
+    url: BASE_URL,
+    siteName: 'ayris.tech YouTube Portal',
+    title: 'ayris.tech YouTube | Code & Resource Portal',
+    description:
+      'Source code, lesson notes, cheatsheets, and project downloads for every ayris.tech YouTube tutorial.',
+    images: [{ url: `${BASE_URL}/logo.jpeg`, width: 400, height: 400, alt: 'ayris.tech Logo' }],
+  },
+  twitter: {
+    card: 'summary_large_image',
+    title: 'ayris.tech YouTube | Code & Resource Portal',
+    description: 'Source code, cheatsheets, AI prompts and downloads for every ayris.tech tutorial.',
+    images: [`${BASE_URL}/logo.jpeg`],
+  },
+  robots: {
+    index: true,
+    follow: true,
+    googleBot: { index: true, follow: true },
+  },
+  alternates: {
+    canonical: BASE_URL,
+  },
 };
 
 export function generateStaticParams() {