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/jsonpath/include/module.js

@@ -0,0 +1,34 @@
+var _ast = {
+
+  initialize: function() {
+    this._nodes = [];
+    this._node = {};
+    this._stash = [];
+  },
+
+  set: function(props) {
+    for (var k in props) this._node[k] = props[k];
+    return this._node;
+  },
+
+  node: function(obj) {
+    if (arguments.length) this._node = obj;
+    return this._node;
+  },
+
+  push: function() {
+    this._nodes.push(this._node);
+    this._node = {};
+  },
+
+  unshift: function() {
+    this._nodes.unshift(this._node);
+    this._node = {};
+  },
+
+  yield: function() {
+    var _nodes = this._nodes;
+    this.initialize();
+    return _nodes;
+  }
+};