first commit

apps/web/src/middleware.ts

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+import { NextRequest, NextResponse } from "next/server";
+
+const ROOT_DOMAIN = process.env.ROOT_DOMAIN ?? "menul.io";
+
+// Wildcard subdomain routing: kebapci-ahmet.menul.io -> /menu/kebapci-ahmet
+// Custom domains resolve here too once verified (PRD §11).
+export function middleware(req: NextRequest) {
+  const host = req.headers.get("host") ?? "";
+  const hostname = host.split(":")[0] ?? host;
+
+  const isRootDomain = hostname === ROOT_DOMAIN || hostname === `www.${ROOT_DOMAIN}`;
+  if (isRootDomain || hostname === "localhost") {
+    return NextResponse.next();
+  }
+
+  const subdomain = hostname.endsWith(`.${ROOT_DOMAIN}`)
+    ? hostname.replace(`.${ROOT_DOMAIN}`, "")
+    : hostname; // custom domain — resolved to a slug via domains table at render time
+
+  const url = req.nextUrl.clone();
+  url.pathname = `/menu/${subdomain}${req.nextUrl.pathname}`;
+  return NextResponse.rewrite(url);
+}
+
+export const config = {
+  matcher: ["/((?!api|_next/static|_next/image|favicon.ico).*)"],
+};