Import project configuration: next.config.mjs

Import the existing local project snapshot. This commit organizes existing files; it does not represent newly developed functionality.

next.config.mjs

@@ -0,0 +1,10 @@
+const nextConfig = {
+  reactStrictMode: true,
+  allowedDevOrigins: ["127.0.0.1"],
+  experimental: {},
+  // Dev/test servers set NEXT_DIST_DIR (e.g. ".next-dev") so they never
+  // mutate the production .next directory that `next start` serves from.
+  distDir: process.env.NEXT_DIST_DIR || ".next",
+};
+
+export default nextConfig;