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/_baseEvery.js

@@ -0,0 +1,21 @@
+var baseEach = require('./_baseEach');
+
+/**
+ * The base implementation of `_.every` without support for iteratee shorthands.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} predicate The function invoked per iteration.
+ * @returns {boolean} Returns `true` if all elements pass the predicate check,
+ *  else `false`
+ */
+function baseEvery(collection, predicate) {
+  var result = true;
+  baseEach(collection, function(value, index, collection) {
+    result = !!predicate(value, index, collection);
+    return result;
+  });
+  return result;
+}
+
+module.exports = baseEvery;