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/@babel/plugin-transform-modules-commonjs/lib/dynamic-import.js

@@ -0,0 +1,16 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.transformDynamicImport = transformDynamicImport;
+var _core = require("@babel/core");
+var _helperModuleTransforms = require("@babel/helper-module-transforms");
+const requireNoInterop = source => _core.template.expression.ast`require(${source})`;
+const requireInterop = (source, file) => _core.types.callExpression(file.addHelper("interopRequireWildcard"), [requireNoInterop(source)]);
+function transformDynamicImport(path, noInterop, file) {
+  const buildRequire = noInterop ? requireNoInterop : requireInterop;
+  path.replaceWith((0, _helperModuleTransforms.buildDynamicImport)(path.node, true, false, specifier => buildRequire(specifier, file)));
+}
+
+//# sourceMappingURL=dynamic-import.js.map