feat: add SEO and GEO discovery metadata

src/app/login/layout.tsx

@@ -0,0 +1,12 @@
+import type { Metadata } from "next";
+
+export const metadata: Metadata = {
+  title: "Giriş",
+  description: "AdSeeQ hesabınıza giriş yapın.",
+  alternates: { canonical: "/login" },
+  robots: { index: false, follow: false, nocache: true }
+};
+
+export default function LoginLayout({ children }: { children: React.ReactNode }) {
+  return children;
+}