feat(web): complete MVP0 public layout, banner, and SEO baseline

apps/web/src/app/layout.tsx

@@ -3,9 +3,30 @@ import type { ReactNode } from "react"
 
 import "./globals.css"
 
+const metadataBase = new URL(process.env.CMS_WEB_ORIGIN ?? "http://localhost:3000")
+
 export const metadata: Metadata = {
-  title: "CMS Web",
+  metadataBase,
+  title: {
+    default: "CMS Web",
+    template: "%s | CMS Web",
+  },
   description: "Public frontend for the CMS monorepo",
+  applicationName: "CMS Web",
+  openGraph: {
+    type: "website",
+    siteName: "CMS Web",
+    title: "CMS Web",
+    description: "Public frontend for the CMS monorepo",
+    url: metadataBase,
+  },
+  alternates: {
+    canonical: "/",
+  },
+  robots: {
+    index: true,
+    follow: true,
+  },
 }
 
 export default function RootLayout({ children }: { children: ReactNode }) {