feat: context switching of hotel/airline depndent on env var via middleware

web/src/app/airline/layout.tsx

@@ -0,0 +1,4 @@
+import { ReactNode } from 'react';
+export default function AirlineLayout({ children }: { children: ReactNode }) {
+  return <>{children}</>;
+}

web/src/app/airline/page.tsx

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+export default function AirlineHome() {
+  return (
+    <div className="flex min-h-screen items-center justify-center">
+      <h1 className="text-3xl font-bold">Airline Mode</h1>
+    </div>
+  );
+}

web/src/app/hotel/layout.tsx

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+import { ReactNode } from 'react';
+export default function HotelLayout({ children }: { children: ReactNode }) {
+  return <>{children}</>;
+}

web/src/app/hotel/page.tsx

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+export default function HotelHome() {
+  return (
+    <div className="flex min-h-screen items-center justify-center">
+      <h1 className="text-3xl font-bold">Hotel Mode</h1>
+    </div>
+  );
+}

web/src/middleware.ts

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+import { NextRequest, NextResponse } from 'next/server';
+
+export function middleware(req: NextRequest) {
+    const mode = process.env.STORE_MODE;
+    const { pathname } = req.nextUrl;
+
+    // skip rewrites for api routes, static files, and next internals
+    if (
+        pathname.startsWith('/api') ||
+        pathname.startsWith('/_next') ||
+        pathname.startsWith('/static') ||
+        pathname.includes('.')
+        // TODO: add robots.txt and sitemap.xml if needed here
+    ) {
+        return NextResponse.next();
+    }
+
+    // already prefixed with mode
+    if (pathname.startsWith(`/${mode}`)) {
+        return NextResponse.next();
+    }
+
+    // rewrite root and unprefixed paths to mode-specific route group
+    const url = req.nextUrl.clone();
+    url.pathname = `/${mode}${pathname === '/' ? '' : pathname}`;
+
+    return NextResponse.rewrite(url);
+}
+
+export const config = {
+    matcher: [
+        // match all paths except those starting with _next/static, _next/image, favicon.ico
+        '/((?!_next/static|_next/image|favicon.ico).*)',
+    ],
+};