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/esm5/internal/util/args.js

@@ -0,0 +1,15 @@
+import { isFunction } from './isFunction';
+import { isScheduler } from './isScheduler';
+function last(arr) {
+    return arr[arr.length - 1];
+}
+export function popResultSelector(args) {
+    return isFunction(last(args)) ? args.pop() : undefined;
+}
+export function popScheduler(args) {
+    return isScheduler(last(args)) ? args.pop() : undefined;
+}
+export function popNumber(args, defaultValue) {
+    return typeof last(args) === 'number' ? args.pop() : defaultValue;
+}
+//# sourceMappingURL=args.js.map