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/es-iterator-helpers/aos/IteratorCloseAll.js

@@ -0,0 +1,34 @@
+'use strict';
+
+var $TypeError = require('es-errors/type');
+
+var CompletionRecord = require('es-abstract/2025/CompletionRecord');
+var IteratorClose = require('es-abstract/2025/IteratorClose');
+var ThrowCompletion = require('es-abstract/2025/ThrowCompletion');
+
+var IsArray = require('es-abstract/helpers/IsArray');
+var every = require('es-abstract/helpers/every');
+
+var isIteratorRecord = require('es-abstract/helpers/records/iterator-record');
+
+// https://tc39.es/proposal-joint-iteration/#sec-closeall
+
+module.exports = function IteratorCloseAll(iters, completion) {
+	if (!IsArray(iters) || !every(iters, isIteratorRecord)) {
+		throw new $TypeError('Assertion failed: `iters` must be a List of IteratorRecords');
+	}
+	if (!(completion instanceof CompletionRecord)) {
+		throw new $TypeError('Assertion failed: `completion` must be a Completion Record');
+	}
+
+	for (var i = iters.length - 1; i >= 0; i -= 1) { // step 1
+		try {
+			IteratorClose(iters[i], completion); // step 1.a
+		} catch (e) {
+			// eslint-disable-next-line no-param-reassign
+			completion = ThrowCompletion(e); // step 1.a
+		}
+	}
+
+	return completion['?'](); // step 2
+};