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/any-promise/register.d.ts

@@ -0,0 +1,17 @@
+import Promise = require('./index');
+
+declare function register (module?: string, options?: register.Options): register.Register;
+
+declare namespace register {
+  export interface Register {
+    Promise: typeof Promise;
+    implementation: string;
+  }
+
+  export interface Options {
+      Promise?: typeof Promise;
+      global?: boolean
+  }
+}
+
+export = register;