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/builtin-modules/index.js

@@ -0,0 +1,11 @@
+'use strict';
+const {builtinModules} = require('module');
+
+const ignoreList = [
+	'sys'
+];
+
+// eslint-disable-next-line node/no-deprecated-api
+module.exports = (builtinModules || (process.binding ? Object.keys(process.binding('natives')) : []) || [])
+	.filter(x => !/^_|^(internal|v8|node-inspect)\/|\//.test(x) && !ignoreList.includes(x))
+	.sort();