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/@nicolo-ribaudo/eslint-scope-5-internals/index.js

@@ -0,0 +1,8 @@
+"use strict";
+
+module.exports = {
+    ...require("eslint-scope"),
+    Definition: require("eslint-scope/lib/definition").Definition,
+    PatternVisitor: require("eslint-scope/lib/pattern-visitor"),
+    Referencer: require("eslint-scope/lib/referencer"),
+};