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/bonjour-service/dist/lib/mdns-server.d.ts

@@ -0,0 +1,14 @@
+import { ServiceConfig, ServiceRecord } from './service';
+export declare class Server {
+    mdns: any;
+    private registry;
+    private errorCallback;
+    constructor(opts: Partial<ServiceConfig>, errorCallback?: Function | undefined);
+    register(records: Array<ServiceRecord> | ServiceRecord): void;
+    unregister(records: Array<ServiceRecord> | ServiceRecord): void;
+    private respondToQuery;
+    private recordsFor;
+    private isDuplicateRecord;
+    private unique;
+}
+export default Server;