Restore AppController extension for BC compatibility

src/Controller/Admin/QueueAppController.php

@@ -3,26 +3,34 @@
 
 namespace Queue\Controller\Admin;
 
+use App\Controller\AppController;
 use Cake\Controller\Controller;
 use Cake\Core\Configure;
 
 /**
  * QueueAppController
  *
- * Isolated base controller for Queue admin that doesn't depend on host app's AppController.
- * This ensures the admin dashboard can function independently with its own layout and styling.
+ * Base controller for Queue admin.
+ *
+ * By default, extends AppController to inherit app authentication, components, and configuration.
+ * Set `Queue.standalone` to `true` for an isolated admin that doesn't depend on the host app.
  */
-class QueueAppController extends Controller {
+class QueueAppController extends AppController {
 
 	use LoadHelperTrait;
 
 	/**
 	 * @return void
 	 */
 	public function initialize(): void {
-		parent::initialize();
-
-		$this->loadComponent('Flash');
+		if (Configure::read('Queue.standalone')) {
+			// Standalone mode: skip app's AppController, initialize independently
+			Controller::initialize();
+			$this->loadComponent('Flash');
+		} else {
+			// Default: inherit app's full controller setup
+			parent::initialize();
+		}
 
 		$this->loadHelpers();
 

tests/TestCase/Controller/Admin/QueueControllerTest.php

@@ -3,6 +3,7 @@
 
 namespace Queue\Test\TestCase\Controller\Admin;
 
+use Cake\Core\Configure;
 use Cake\Datasource\ConnectionManager;
 use Cake\Http\ServerRequest;
 use Cake\I18n\DateTime;
@@ -276,6 +277,17 @@ public function testHardReset() {
 		$this->assertSame(0, $count);
 	}
 
+	/**
+	 * @return void
+	 */
+	public function testIndexStandalone(): void {
+		Configure::write('Queue.standalone', true);
+
+		$this->get(['prefix' => 'Admin', 'plugin' => 'Queue', 'controller' => 'Queue', 'action' => 'index']);
+
+		$this->assertResponseCode(200);
+	}
+
 	/**
 	 * Helper method for skipping tests that need a real connection.
 	 *