fix: prevent asset conflicts between React and Grid.js versions

Add coexistence checks to all enqueue methods to prevent loading
both React and Grid.js assets simultaneously.

Changes:
- ReactAdmin.php: Only enqueue React assets when ?react=1
- Init.php: Skip Grid.js when React active on admin pages
- Form.php, Coupon.php, Access.php: Restore classic assets when ?react=0
- Customer.php, Product.php, License.php: Add coexistence checks

Now the toggle between Classic and React versions works correctly.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

node_modules/lodash/_initCloneObject.js

@@ -0,0 +1,18 @@
+var baseCreate = require('./_baseCreate'),
+    getPrototype = require('./_getPrototype'),
+    isPrototype = require('./_isPrototype');
+
+/**
+ * Initializes an object clone.
+ *
+ * @private
+ * @param {Object} object The object to clone.
+ * @returns {Object} Returns the initialized clone.
+ */
+function initCloneObject(object) {
+  return (typeof object.constructor == 'function' && !isPrototype(object))
+    ? baseCreate(getPrototype(object))
+    : {};
+}
+
+module.exports = initCloneObject;