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

Club12-Backend/Application/DTOs/Roster/Request/CopyRosterRequest.cs

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+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace Application.DTOs.Roster.Request;
+
+/// <summary>
+/// Request to clone a roster from a previous season's team into a new season's team taken from the route.
+/// </summary>
+public class CopyRosterRequest
+{
+    /// <summary>
+    /// The past-season team whose roster is the source.
+    /// </summary>
+    [Required]
+    public required Guid SourceTeamId { get; set; }
+
+    /// <summary>
+    /// The season the source roster belongs to.
+    /// </summary>
+    [Required]
+    public required Guid SourceTournamentId { get; set; }
+
+    /// <summary>
+    /// The new season the roster is cloned into.
+    /// </summary>
+    [Required]
+    public required Guid TargetTournamentId { get; set; }
+}

Club12-Backend/Application/DTOs/Roster/Response/RosterCopyResult.cs

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+namespace Application.DTOs.Roster.Response;
+
+/// <summary>
+/// Outcome of copying a roster from a previous season into a new season.
+/// </summary>
+public class RosterCopyResult
+{
+    /// <summary>
+    /// New season registrations created on the target team.
+    /// </summary>
+    public required int CopiedCount { get; set; }
+
+    /// <summary>
+    /// Source players skipped because they were already registered to the target season.
+    /// </summary>
+    public required int SkippedCount { get; set; }
+}