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/rxjs/dist/cjs/internal/util/executeSchedule.js

@@ -0,0 +1,22 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.executeSchedule = void 0;
+function executeSchedule(parentSubscription, scheduler, work, delay, repeat) {
+    if (delay === void 0) { delay = 0; }
+    if (repeat === void 0) { repeat = false; }
+    var scheduleSubscription = scheduler.schedule(function () {
+        work();
+        if (repeat) {
+            parentSubscription.add(this.schedule(null, delay));
+        }
+        else {
+            this.unsubscribe();
+        }
+    }, delay);
+    parentSubscription.add(scheduleSubscription);
+    if (!repeat) {
+        return scheduleSubscription;
+    }
+}
+exports.executeSchedule = executeSchedule;
+//# sourceMappingURL=executeSchedule.js.map