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/bonjour-service/dist/lib/mdns-server.d.ts

@@ -0,0 +1,14 @@
+import { ServiceConfig, ServiceRecord } from './service';
+export declare class Server {
+    mdns: any;
+    private registry;
+    private errorCallback;
+    constructor(opts: Partial<ServiceConfig>, errorCallback?: Function | undefined);
+    register(records: Array<ServiceRecord> | ServiceRecord): void;
+    unregister(records: Array<ServiceRecord> | ServiceRecord): void;
+    private respondToQuery;
+    private recordsFor;
+    private isDuplicateRecord;
+    private unique;
+}
+export default Server;