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/backpack.mjs

@@ -0,0 +1,22 @@
+/**
+ * lucide-react v0.0.1 - ISC
+ */
+
+import createLucideIcon from '../createLucideIcon.mjs';
+
+const Backpack = createLucideIcon("Backpack", [
+  [
+    "path",
+    {
+      d: "M4 20V10a4 4 0 0 1 4-4h8a4 4 0 0 1 4 4v10a2 2 0 0 1-2 2H6a2 2 0 0 1-2-2Z",
+      key: "tunmdx"
+    }
+  ],
+  ["path", { d: "M9 6V4a2 2 0 0 1 2-2h2a2 2 0 0 1 2 2v2", key: "donm21" }],
+  ["path", { d: "M8 21v-5a2 2 0 0 1 2-2h4a2 2 0 0 1 2 2v5", key: "xk3gvk" }],
+  ["path", { d: "M8 10h8", key: "c7uz4u" }],
+  ["path", { d: "M8 18h8", key: "1no2b1" }]
+]);
+
+export { Backpack as default };
+//# sourceMappingURL=backpack.mjs.map