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/stethoscope.mjs

@@ -0,0 +1,20 @@
+/**
+ * lucide-react v0.0.1 - ISC
+ */
+
+import createLucideIcon from '../createLucideIcon.mjs';
+
+const Stethoscope = createLucideIcon("Stethoscope", [
+  [
+    "path",
+    {
+      d: "M4.8 2.3A.3.3 0 1 0 5 2H4a2 2 0 0 0-2 2v5a6 6 0 0 0 6 6v0a6 6 0 0 0 6-6V4a2 2 0 0 0-2-2h-1a.2.2 0 1 0 .3.3",
+      key: "1jd90r"
+    }
+  ],
+  ["path", { d: "M8 15v1a6 6 0 0 0 6 6v0a6 6 0 0 0 6-6v-4", key: "126ukv" }],
+  ["circle", { cx: "20", cy: "10", r: "2", key: "ts1r5v" }]
+]);
+
+export { Stethoscope as default };
+//# sourceMappingURL=stethoscope.mjs.map