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/bluebird/js/release/bluebird.js

@@ -0,0 +1,11 @@
+"use strict";
+var old;
+if (typeof Promise !== "undefined") old = Promise;
+function noConflict() {
+    try { if (Promise === bluebird) Promise = old; }
+    catch (e) {}
+    return bluebird;
+}
+var bluebird = require("./promise")();
+bluebird.noConflict = noConflict;
+module.exports = bluebird;