Add factory reset functionality and update identity service

- Introduced a new DELETE endpoint `/api/admin/maintenance/factory-reset` for a complete reset of the admin panel, removing all users except the current admin and clearing various data.
- Implemented the `FactoryReset` method in `AdminMaintenanceEndpoints` to handle the reset logic.
- Added a new method `ListAllUserIdsExceptAsync` in `IIdentityService` to retrieve user IDs excluding a specified user, aiding in the factory reset process.
- Updated the frontend to include a confirmation dialog for the factory reset action, enhancing user experience and safety.
- Enhanced localization support for the new factory reset feature in both Russian and English, ensuring clarity for all users.

backend/src/PnvPanel.Application/Admin/Maintenance/FactoryResetCommand.cs

@@ -0,0 +1,11 @@
+using PnvPanel.Application.Common.Messaging;
+using PnvPanel.Application.Common.Models;
+
+namespace PnvPanel.Application.Admin.Maintenance;
+
+/// <summary>
+/// Полный сброс панели к состоянию свежего деплоя: все пользователи кроме текущего админа,
+/// конфиги, ноды/инбаунды, тикеты (+вложения), новости, аудит и кастомные роли удаляются;
+/// каталог приложений пересеивается из seed/client-apps.json. Необратимо.
+/// </summary>
+public sealed record FactoryResetCommand : ICommand<Result>;