fix: correct npm command formatting in GitHub Actions workflow and add basePath to Next.js config

crypto_clash_frontend/next.config.ts

@@ -1,6 +1,7 @@
 import type { NextConfig } from "next";
 
 const nextConfig: NextConfig = {
+  basePath: "/crypto_clash",
   output: "export",  // <=== enables static exports
   reactStrictMode: true,
 };