Add CYD browser flasher with Next.js, i18n, and Web Serial install.

Replace the starter app with a public/local flasher that discovers sibling firmwares, supports en/zh, and documents HTTPS deploy.

Co-authored-by: Cursor <cursoragent@cursor.com>

middleware.ts

@@ -0,0 +1,8 @@
+import createMiddleware from "next-intl/middleware";
+import { routing } from "./i18n/routing";
+
+export default createMiddleware(routing);
+
+export const config = {
+  matcher: ["/", "/(en|zh)/:path*", "/((?!api|_next|_vercel|.*\\..*).*)"],
+};