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/lucide-react/dist/esm/icons/russian-ruble.mjs

@@ -0,0 +1,16 @@
+/**
+ * lucide-react v0.0.1 - ISC
+ */
+
+import createLucideIcon from '../createLucideIcon.mjs';
+
+const RussianRuble = createLucideIcon("RussianRuble", [
+  ["path", { d: "M14 11c5.333 0 5.333-8 0-8", key: "92e629" }],
+  ["path", { d: "M6 11h8", key: "1cr2u4" }],
+  ["path", { d: "M6 15h8", key: "1y8f6l" }],
+  ["path", { d: "M9 21V3", key: "1jd2g6" }],
+  ["path", { d: "M9 3h5", key: "8bgvcw" }]
+]);
+
+export { RussianRuble as default };
+//# sourceMappingURL=russian-ruble.mjs.map