refactor: Migrate Next.js configuration from TypeScript to ES module format and add package-lock.json.

next.config.mjs

@@ -0,0 +1,9 @@
+/** @type {import('next').NextConfig} */
+const config = {
+    output: "export",
+    images: {
+        unoptimized: true,
+    },
+};
+
+export default config;