Sube carpetas API, API.Tests, Application y Domain del Backend

Club12-Backend/Application/DTOs/Backup/Response/BackupRecordResponse.cs

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+using Domain.Entities.Models;
+
+using System;
+
+namespace Application.DTOs.Backup.Response;
+
+/// <summary>
+/// Response projection of a catalogued BackupRecord, with Origin serialized as its enum name.
+/// </summary>
+public sealed record BackupRecordResponse(
+    Guid Id, DateTime CreatedAt, long SizeBytes, string Origin, string StoragePath)
+{
+    public static BackupRecordResponse FromEntity(BackupRecord record)
+    {
+        return new BackupRecordResponse(
+            record.Id, record.DateCreated, record.SizeBytes, record.Origin.ToString(), record.StoragePath);
+    }
+}

Club12-Backend/Application/DTOs/Backup/Response/MaintenanceStatusResponse.cs

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+using System;
+
+namespace Application.DTOs.Backup.Response;
+
+/// <summary>
+/// The current maintenance window; Reason and EnteredAtUtc are null when IsActive is false.
+/// </summary>
+public sealed record MaintenanceStatusResponse(bool IsActive, string? Reason, DateTimeOffset? EnteredAtUtc);