Improve SEO metadata and structured data

app/layout.tsx

@@ -1,6 +1,8 @@
 import type { Metadata } from "next";
 import "./globals.css";
 import "./portfolio.css";
+import { getDefaultSeoMetadata } from "@/data/seo";
+import { siteUrl } from "@/data/site-config";
 
 const themeInitScript = `
 (() => {
@@ -18,22 +20,8 @@ const themeInitScript = `
 `;
 
 export const metadata: Metadata = {
-  title: "Grace Butrus Salmoun | Architectural Engineer Specialized in Architectural Design",
-  description:
-    "A bilingual architecture portfolio for Grace Butrus Salmoun, an architectural engineer specialized in architectural design, working across urban rehabilitation, landscape, shop drawings, and visual presentation.",
-  metadataBase: new URL("https://grace-salamoun-architect.vercel.app"),
-  openGraph: {
-    title: "Grace Butrus Salmoun | Architectural Engineer Specialized in Architectural Design",
-    description:
-      "Architectural design, urban rehabilitation, landscape, shop drawings, and visual presentation in English and Arabic.",
-    type: "website",
-  },
-  twitter: {
-    card: "summary_large_image",
-    title: "Grace Butrus Salmoun | Architectural Engineer Specialized in Architectural Design",
-    description:
-      "A bilingual architecture portfolio featuring selected works, technical documentation, and visual presentation.",
-  },
+  metadataBase: new URL(siteUrl),
+  ...getDefaultSeoMetadata(),
 };
 
 export default function RootLayout({