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/anymatch/index.d.ts

@@ -0,0 +1,20 @@
+type AnymatchFn = (testString: string) => boolean;
+type AnymatchPattern = string|RegExp|AnymatchFn;
+type AnymatchMatcher = AnymatchPattern|AnymatchPattern[]
+type AnymatchTester = {
+  (testString: string|any[], returnIndex: true): number;
+  (testString: string|any[]): boolean;
+}
+
+type PicomatchOptions = {dot: boolean};
+
+declare const anymatch: {
+  (matchers: AnymatchMatcher): AnymatchTester;
+  (matchers: AnymatchMatcher, testString: null, returnIndex: true | PicomatchOptions): AnymatchTester;
+  (matchers: AnymatchMatcher, testString: string|any[], returnIndex: true | PicomatchOptions): number;
+  (matchers: AnymatchMatcher, testString: string|any[]): boolean;
+}
+
+export {AnymatchMatcher as Matcher}
+export {AnymatchTester as Tester}
+export default anymatch