Add restore functionality for template management and enhance related components

Implemented a new endpoint for restoring templates to their last applied state, allowing users to revert changes made since the last application. Updated the ScheduleTemplate class to include a snapshot of the last applied state, enabling rollback capabilities. Enhanced the frontend with a restore button in the ChannelDetail component, providing users with a confirmation prompt before executing the restore action. Localization updates were made to support new UI strings in both English and Russian, improving the overall user experience in template management.

backend/src/TeleWave.Api/Endpoints/TemplateEndpoints.cs

@@ -11,6 +11,7 @@ using TeleWave.Application.Programming.Templates.DeleteSlot;
 using TeleWave.Application.Programming.Templates.Generate;
 using TeleWave.Application.Programming.Templates.GetTemplate;
 using TeleWave.Application.Programming.Templates.Layers;
+using TeleWave.Application.Programming.Templates.Restore;
 using TeleWave.Application.Programming.Templates.UpdateSlot;
 using TeleWave.Application.Programming.Templates.Validate;
 using TeleWave.Infrastructure.Identity;
@@ -44,6 +45,10 @@ public static class TemplateEndpoints
         admin
             .MapPost("/channels/{channelId:guid}/template/apply", ApplyTemplate)
             .Produces<ApplyResultDto>();
+        // Откат правок к состоянию, по которому идёт эфир. Ленту не трогает — она и так по нему.
+        admin
+            .MapPost("/channels/{channelId:guid}/template/restore", RestoreTemplate)
+            .Produces<RestoreTemplateResultDto>();
         // Предпросмотр — тот же генератор, но без записи и без продвижения курсоров.
         admin
             .MapGet("/channels/{channelId:guid}/template/preview", PreviewTemplate)
@@ -137,6 +142,16 @@ public static class TemplateEndpoints
         return result.ToHttpResult();
     }
 
+    private static async Task<IResult> RestoreTemplate(
+        Guid channelId,
+        ISender sender,
+        CancellationToken cancellationToken
+    )
+    {
+        var result = await sender.Send(new RestoreTemplateCommand(channelId), cancellationToken);
+        return result.ToHttpResult();
+    }
+
     private static async Task<IResult> PreviewTemplate(
         Guid channelId,
         ISender sender,