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/@sentry/node/README.md

@@ -0,0 +1,64 @@
+<p align="center">
+  <a href="https://sentry.io" target="_blank" align="center">
+    <img src="https://sentry-brand.storage.googleapis.com/sentry-logo-black.png" width="280">
+  </a>
+  <br />
+</p>
+
+# Official Sentry SDK for NodeJS
+
+[![npm version](https://img.shields.io/npm/v/@sentry/node.svg)](https://www.npmjs.com/package/@sentry/node)
+[![npm dm](https://img.shields.io/npm/dm/@sentry/node.svg)](https://www.npmjs.com/package/@sentry/node)
+[![npm dt](https://img.shields.io/npm/dt/@sentry/node.svg)](https://www.npmjs.com/package/@sentry/node)
+[![typedoc](https://img.shields.io/badge/docs-typedoc-blue.svg)](http://getsentry.github.io/sentry-javascript/)
+
+## Links
+
+- [Official SDK Docs](https://docs.sentry.io/quickstart/)
+- [TypeDoc](http://getsentry.github.io/sentry-javascript/)
+
+## Usage
+
+To use this SDK, call `init(options)` as early as possible in the main entry module. This will initialize the SDK and
+hook into the environment. Note that you can turn off almost all side effects using the respective options.
+
+```javascript
+// ES5 Syntax
+const Sentry = require('@sentry/node');
+// ES6 Syntax
+import * as Sentry from '@sentry/node';
+
+Sentry.init({
+  dsn: '__DSN__',
+  // ...
+});
+```
+
+To set context information or send manual events, use the exported functions of `@sentry/node`. Note that these
+functions will not perform any action before you have called `init()`:
+
+```javascript
+// Set user information, as well as tags and further extras
+Sentry.configureScope(scope => {
+  scope.setExtra('battery', 0.7);
+  scope.setTag('user_mode', 'admin');
+  scope.setUser({ id: '4711' });
+  // scope.clear();
+});
+
+// Add a breadcrumb for future events
+Sentry.addBreadcrumb({
+  message: 'My Breadcrumb',
+  // ...
+});
+
+// Capture exceptions, messages or manual events
+Sentry.captureMessage('Hello, world!');
+Sentry.captureException(new Error('Good bye'));
+Sentry.captureEvent({
+  message: 'Manual',
+  stacktrace: [
+    // ...
+  ],
+});
+```