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/reakit/lib/Input/Input.js

@@ -0,0 +1,37 @@
+'use strict';
+
+Object.defineProperty(exports, '__esModule', { value: true });
+
+require('../_rollupPluginBabelHelpers-8f9a8751.js');
+var createComponent = require('reakit-system/createComponent');
+var createHook = require('reakit-system/createHook');
+require('reakit-utils/shallowEqual');
+require('react');
+require('reakit-utils/useForkRef');
+require('reakit-utils/isButton');
+require('reakit-warning');
+require('reakit-utils/useLiveRef');
+require('reakit-utils/useIsomorphicEffect');
+require('reakit-utils/hasFocusWithin');
+require('reakit-utils/isPortalEvent');
+require('reakit-utils/dom');
+require('reakit-utils/tabbable');
+require('../Role/Role.js');
+var Tabbable_Tabbable = require('../Tabbable/Tabbable.js');
+
+// Automatically generated
+var INPUT_KEYS = [];
+
+var useInput = createHook.createHook({
+  name: "Input",
+  compose: Tabbable_Tabbable.useTabbable,
+  keys: INPUT_KEYS
+});
+var Input = createComponent.createComponent({
+  as: "input",
+  memo: true,
+  useHook: useInput
+});
+
+exports.Input = Input;
+exports.useInput = useInput;

node_modules/reakit/lib/Input/index.js

@@ -0,0 +1,26 @@
+'use strict';
+
+Object.defineProperty(exports, '__esModule', { value: true });
+
+require('../_rollupPluginBabelHelpers-8f9a8751.js');
+require('reakit-system/createComponent');
+require('reakit-system/createHook');
+require('reakit-utils/shallowEqual');
+require('react');
+require('reakit-utils/useForkRef');
+require('reakit-utils/isButton');
+require('reakit-warning');
+require('reakit-utils/useLiveRef');
+require('reakit-utils/useIsomorphicEffect');
+require('reakit-utils/hasFocusWithin');
+require('reakit-utils/isPortalEvent');
+require('reakit-utils/dom');
+require('reakit-utils/tabbable');
+require('../Role/Role.js');
+require('../Tabbable/Tabbable.js');
+var Input_Input = require('./Input.js');
+
+
+
+exports.Input = Input_Input.Input;
+exports.useInput = Input_Input.useInput;