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/math-intrinsics/constants/maxArrayLength.d.ts

@@ -0,0 +1,3 @@
+declare const MAX_ARRAY_LENGTH: 4294967295;
+
+export = MAX_ARRAY_LENGTH;

node_modules/math-intrinsics/constants/maxArrayLength.js

@@ -0,0 +1,4 @@
+'use strict';
+
+/** @type {import('./maxArrayLength')} */
+module.exports = 4294967295; // Math.pow(2, 32) - 1;

node_modules/math-intrinsics/constants/maxSafeInteger.d.ts

@@ -0,0 +1,3 @@
+declare const MAX_SAFE_INTEGER: 9007199254740991;
+
+export = MAX_SAFE_INTEGER;

node_modules/math-intrinsics/constants/maxSafeInteger.js

@@ -0,0 +1,5 @@
+'use strict';
+
+/** @type {import('./maxSafeInteger')} */
+// eslint-disable-next-line no-extra-parens
+module.exports = /** @type {import('./maxSafeInteger')} */ (Number.MAX_SAFE_INTEGER) || 9007199254740991; // Math.pow(2, 53) - 1;

node_modules/math-intrinsics/constants/maxValue.d.ts

@@ -0,0 +1,3 @@
+declare const MAX_VALUE: 1.7976931348623157e+308;
+
+export = MAX_VALUE;

node_modules/math-intrinsics/constants/maxValue.js

@@ -0,0 +1,5 @@
+'use strict';
+
+/** @type {import('./maxValue')}  */
+// eslint-disable-next-line no-extra-parens
+module.exports = /** @type {import('./maxValue')}  */ (Number.MAX_VALUE) || 1.7976931348623157e+308;