Build Kozmos QR menu site — full implementation

Next.js 16 App Router, TR/EN i18n via [lang] routing and proxy.ts,
Tailwind v4, minimal list menu style, sticky bottom tab bar with
Intersection Observer, PWA manifest, WhatsApp fixed button.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

proxy.ts

@@ -0,0 +1,22 @@
+import { NextResponse } from 'next/server'
+import type { NextRequest } from 'next/server'
+
+const locales = ['tr', 'en']
+const defaultLocale = 'tr'
+
+export function proxy(request: NextRequest) {
+  const { pathname } = request.nextUrl
+
+  const hasLocale = locales.some(
+    (locale) => pathname === `/${locale}` || pathname.startsWith(`/${locale}/`)
+  )
+
+  if (!hasLocale) {
+    request.nextUrl.pathname = `/${defaultLocale}${pathname}`
+    return NextResponse.redirect(request.nextUrl)
+  }
+}
+
+export const config = {
+  matcher: ['/((?!_next|favicon.ico|icons|manifest.webmanifest).*)'],
+}