feat: configure next-intl i18n with ES/EN locales

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

apps/web/next.config.ts

@@ -1,5 +1,7 @@
-import type { NextConfig } from "next";
+import createNextIntlPlugin from "next-intl/plugin";
 
-const nextConfig: NextConfig = {};
+const withNextIntl = createNextIntlPlugin("./src/i18n/request.ts");
 
-export default nextConfig;
+const nextConfig = {};
+
+export default withNextIntl(nextConfig);