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/webpack-bundle-analyzer/lib/tree/utils.js

@@ -0,0 +1,21 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.getModulePathParts = getModulePathParts;
+const MULTI_MODULE_REGEXP = /^multi /u;
+
+function getModulePathParts(moduleData) {
+  if (MULTI_MODULE_REGEXP.test(moduleData.identifier)) {
+    return [moduleData.identifier];
+  }
+
+  const loaders = moduleData.name.split('!'); // Removing loaders from module path: they're joined by `!` and the last part is a raw module path
+
+  const parsedPath = loaders[loaders.length - 1] // Splitting module path into parts
+  .split('/') // Removing first `.`
+  .slice(1) // Replacing `~` with `node_modules`
+  .map(part => part === '~' ? 'node_modules' : part);
+  return parsedPath.length ? parsedPath : null;
+}