Initial commit: Developer Tools MVP with visual editor

- Complete React app with 7 developer tools
- JSON Tool with visual structured editor
- Serialize Tool with visual structured editor
- URL, Base64, CSV/JSON, Beautifier, Diff tools
- Responsive navigation with dropdown menu
- Dark/light mode toggle
- Mobile-responsive design with sticky header
- All tools working with copy/paste functionality

node_modules/react-router-dom/dist/main.js

@@ -0,0 +1,19 @@
+/**
+ * React Router DOM v6.30.1
+ *
+ * Copyright (c) Remix Software Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE.md file in the root directory of this source tree.
+ *
+ * @license MIT
+ */
+'use strict';
+
+/* eslint-env node */
+
+if (process.env.NODE_ENV === "production") {
+  module.exports = require("./umd/react-router-dom.production.min.js");
+} else {
+  module.exports = require("./umd/react-router-dom.development.js");
+}