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/src/internal/operators/combineLatest.ts

@@ -0,0 +1,34 @@
+import { combineLatestInit } from '../observable/combineLatest';
+import { ObservableInput, ObservableInputTuple, OperatorFunction } from '../types';
+import { operate } from '../util/lift';
+import { argsOrArgArray } from '../util/argsOrArgArray';
+import { mapOneOrManyArgs } from '../util/mapOneOrManyArgs';
+import { pipe } from '../util/pipe';
+import { popResultSelector } from '../util/args';
+
+/** @deprecated Replaced with {@link combineLatestWith}. Will be removed in v8. */
+export function combineLatest<T, A extends readonly unknown[], R>(
+  sources: [...ObservableInputTuple<A>],
+  project: (...values: [T, ...A]) => R
+): OperatorFunction<T, R>;
+/** @deprecated Replaced with {@link combineLatestWith}. Will be removed in v8. */
+export function combineLatest<T, A extends readonly unknown[], R>(sources: [...ObservableInputTuple<A>]): OperatorFunction<T, [T, ...A]>;
+
+/** @deprecated Replaced with {@link combineLatestWith}. Will be removed in v8. */
+export function combineLatest<T, A extends readonly unknown[], R>(
+  ...sourcesAndProject: [...ObservableInputTuple<A>, (...values: [T, ...A]) => R]
+): OperatorFunction<T, R>;
+/** @deprecated Replaced with {@link combineLatestWith}. Will be removed in v8. */
+export function combineLatest<T, A extends readonly unknown[], R>(...sources: [...ObservableInputTuple<A>]): OperatorFunction<T, [T, ...A]>;
+
+/**
+ * @deprecated Replaced with {@link combineLatestWith}. Will be removed in v8.
+ */
+export function combineLatest<T, R>(...args: (ObservableInput<any> | ((...values: any[]) => R))[]): OperatorFunction<T, unknown> {
+  const resultSelector = popResultSelector(args);
+  return resultSelector
+    ? pipe(combineLatest(...(args as Array<ObservableInput<any>>)), mapOneOrManyArgs(resultSelector))
+    : operate((source, subscriber) => {
+        combineLatestInit([source, ...argsOrArgArray(args)])(subscriber);
+      });
+}