ci: a real smoke test for the localized routes, and a single redirect from the root

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

middleware.js

@@ -67,7 +67,7 @@ export default function middleware(request) {
 	// 1. Raiz: negociação de idioma (307)
 	if (pathname === "/") {
 		const targetLocale = resolveRootLocale(request);
-		const url = new URL(`/${targetLocale}/`, request.url);
+		const url = new URL(`/${targetLocale}`, request.url);
 		url.search = search;
 		const response = NextResponse.redirect(url, 307);
 		response.headers.set("Vary", "Accept-Language, Cookie");