feat: rebrand to Domain Scanner platform

Replace GeoExport static site with Next.js domain intelligence app:
real DNS/WHOIS/SSL/HTTP/geo scans, SSE progress, Docker stack,
updated install/uninstall scripts, and full documentation.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/app/layout.tsx

@@ -0,0 +1,52 @@
+import type { Metadata } from "next";
+import { Geist, Geist_Mono } from "next/font/google";
+import "./globals.css";
+import { Providers } from "@/components/providers";
+import { Header } from "@/components/layout/header";
+
+const geistSans = Geist({
+  variable: "--font-geist-sans",
+  subsets: ["latin"],
+});
+
+const geistMono = Geist_Mono({
+  variable: "--font-geist-mono",
+  subsets: ["latin"],
+});
+
+export const metadata: Metadata = {
+  title: {
+    default: "Domain Scanner — Domain intelligence platform",
+    template: "%s | Domain Scanner",
+  },
+  description:
+    "Modern domain intelligence and infrastructure analysis. DNS, WHOIS, SSL, geo, security headers, and monitoring.",
+  keywords: [
+    "domain scanner",
+    "dns",
+    "whois",
+    "ssl",
+    "cybersecurity",
+    "infrastructure",
+  ],
+  openGraph: {
+    title: "Domain Scanner",
+    description: "Advanced domain intelligence with premium UX",
+    type: "website",
+  },
+};
+
+export default function RootLayout({ children }: { children: React.ReactNode }) {
+  return (
+    <html lang="en" suppressHydrationWarning>
+      <body className={`${geistSans.variable} ${geistMono.variable} antialiased`}>
+        <Providers>
+          <div className="gradient-mesh min-h-screen">
+            <Header />
+            <main>{children}</main>
+          </div>
+        </Providers>
+      </body>
+    </html>
+  );
+}