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;

next.config.ts

@@ -1,16 +0,0 @@
-/**
- * Run `build` or `dev` with `SKIP_ENV_VALIDATION` to skip env validation. This is especially useful
- * for Docker builds.
- */
-// import "./src/env.ts";
-
-import { type NextConfig } from "next";
-
-const config: NextConfig = {
-    output: "export",
-    images: {
-        unoptimized: true,
-    },
-};
-
-export default config;