feat: send notification to all users when app version is updated

src/Controllers/AdminController.php

@@ -228,6 +228,25 @@ class AdminController
                 }
             }
             $this->auditService->log('app_version_updated', 'config', null, ['details' => 'App version config updated']);
+
+            $version = $_POST['app_version'] ?? '';
+            $notes = $_POST['release_notes'] ?? '';
+
+            if (!empty($version)) {
+                $notificationModel = new Notification();
+                $noteId = $notificationModel->create([
+                    'user_id' => null,
+                    'title' => "Version {$version} is now available",
+                    'message' => "New version {$version} has been released.\n\n" . strip_tags($notes),
+                    'type' => 'info',
+                ]);
+
+                $fcm = new FCMService();
+                if ($fcm->isConfigured()) {
+                    $fcm->sendToAll("Version {$version} is now available", strip_tags($notes), 'info', $noteId);
+                }
+            }
+
             Session::setFlash('success', 'App version updated successfully.');
             $this->view->redirect('/admin/app-version');
             return;