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/Group/Group.js

@@ -0,0 +1,30 @@
+'use strict';
+
+Object.defineProperty(exports, '__esModule', { value: true });
+
+var _rollupPluginBabelHelpers = require('../_rollupPluginBabelHelpers-8f9a8751.js');
+var createComponent = require('reakit-system/createComponent');
+var createHook = require('reakit-system/createHook');
+require('reakit-utils/shallowEqual');
+var Role_Role = require('../Role/Role.js');
+
+// Automatically generated
+var GROUP_KEYS = [];
+
+var useGroup = createHook.createHook({
+  name: "Group",
+  compose: Role_Role.useRole,
+  keys: GROUP_KEYS,
+  useProps: function useProps(_, htmlProps) {
+    return _rollupPluginBabelHelpers._objectSpread2({
+      role: "group"
+    }, htmlProps);
+  }
+});
+var Group = createComponent.createComponent({
+  as: "div",
+  useHook: useGroup
+});
+
+exports.Group = Group;
+exports.useGroup = useGroup;

node_modules/reakit/lib/Group/index.js

@@ -0,0 +1,15 @@
+'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('../Role/Role.js');
+var Group_Group = require('./Group.js');
+
+
+
+exports.Group = Group_Group.Group;
+exports.useGroup = Group_Group.useGroup;