feat(rbac): add permission for reading owned push notification devices

- Add new permission 'push_notification_device.read_owned' in permissions.dart
- Include the new permission in the _appGuestUserPermissions set in role_permissions.dart

Author: fulleni

lib/src/rbac/permissions.dart

@@ -89,6 +89,9 @@ abstract class Permissions {
       'push_notification_device.create_owned';
   static const String pushNotificationDeviceDeleteOwned =
       'push_notification_device.delete_owned';
+  // Allows reading the user's own push notification devices.
+  static const String pushNotificationDeviceReadOwned =
+      'push_notification_device.read_owned';
 
   // In-App Notification Permissions (User-owned)
   /// Allows reading the user's own in-app notifications.

lib/src/rbac/role_permissions.dart

@@ -24,6 +24,7 @@ final Set<String> _appGuestUserPermissions = {
   // notifications.
   Permissions.pushNotificationDeviceCreateOwned,
   Permissions.pushNotificationDeviceDeleteOwned,
+  Permissions.pushNotificationDeviceReadOwned,
   // Allow all app users to manage their own in-app notifications.
   Permissions.inAppNotificationReadOwned,
   Permissions.inAppNotificationUpdateOwned,