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/@sentry/utils/dist/polyfill.js

@@ -0,0 +1,25 @@
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.setPrototypeOf = Object.setPrototypeOf || ({ __proto__: [] } instanceof Array ? setProtoOf : mixinProperties);
+/**
+ * setPrototypeOf polyfill using __proto__
+ */
+// eslint-disable-next-line @typescript-eslint/ban-types
+function setProtoOf(obj, proto) {
+    // @ts-ignore __proto__ does not exist on obj
+    obj.__proto__ = proto;
+    return obj;
+}
+/**
+ * setPrototypeOf polyfill using mixin
+ */
+// eslint-disable-next-line @typescript-eslint/ban-types
+function mixinProperties(obj, proto) {
+    for (var prop in proto) {
+        if (!Object.prototype.hasOwnProperty.call(obj, prop)) {
+            // @ts-ignore typescript complains about indexing so we remove
+            obj[prop] = proto[prop];
+        }
+    }
+    return obj;
+}
+//# sourceMappingURL=polyfill.js.map