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/esm/internal/util/mapOneOrManyArgs.js

@@ -0,0 +1,9 @@
+import { map } from "../operators/map";
+const { isArray } = Array;
+function callOrApply(fn, args) {
+    return isArray(args) ? fn(...args) : fn(args);
+}
+export function mapOneOrManyArgs(fn) {
+    return map(args => callOrApply(fn, args));
+}
+//# sourceMappingURL=mapOneOrManyArgs.js.map