seo: sitemap, robots, og tags

frontend/src/app/layout.tsx

@@ -7,10 +7,40 @@ import "@fontsource/inter/700.css";
 import { Providers } from "./providers";
 import "./globals.css";
 
+const siteUrl = process.env.NEXT_PUBLIC_SITE_URL || "https://codetutor.example.com";
+
 export const metadata: Metadata = {
-  title: "CodeTutor - Coding Interview Preparation",
+  title: {
+    default: "CodeTutor - Coding Interview Preparation",
+    template: "%s | CodeTutor",
+  },
   description:
-    "Master coding interviews with curated questions, detailed explanations, and optimal solutions.",
+    "Master coding interviews with curated questions, detailed explanations, and optimal solutions. Practice 400+ problems with interactive code editor.",
+  keywords: [
+    "coding interview",
+    "leetcode",
+    "algorithm",
+    "data structures",
+    "programming practice",
+    "software engineering",
+  ],
+  authors: [{ name: "Kai Chappell" }],
+  openGraph: {
+    type: "website",
+    locale: "en_US",
+    url: siteUrl,
+    siteName: "CodeTutor",
+    title: "CodeTutor - Coding Interview Preparation",
+    description:
+      "Master coding interviews with curated questions, detailed explanations, and optimal solutions.",
+  },
+  twitter: {
+    card: "summary_large_image",
+    title: "CodeTutor - Coding Interview Preparation",
+    description:
+      "Master coding interviews with curated questions, detailed explanations, and optimal solutions.",
+  },
+  metadataBase: new URL(siteUrl),
 };
 
 export default function RootLayout({