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

Club12-Backend/Application/DTOs/Club/Request/LinkClubParentRequest.cs

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+using System;
+
+namespace Application.DTOs.Club.Request;
+
+/// <summary>
+/// Links a club as a squad of the given parent institution club.
+/// </summary>
+public class LinkClubParentRequest
+{
+    public required Guid ParentClubId { get; set; }
+}

Club12-Backend/Application/DTOs/Club/Request/RenameClubRequest.cs

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+namespace Application.DTOs.Club.Request;
+
+/// <summary>
+/// Renames a club. The club's slug (used in its public URL) never changes, only its display name.
+/// </summary>
+public class RenameClubRequest
+{
+    public required string Name { get; set; }
+}

Club12-Backend/Application/DTOs/Club/Response/ClubBackfillResult.cs

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+namespace Application.DTOs.Club.Response;
+
+/// <summary>
+/// Outcome of the idempotent club backfill; a second run reports zeros.
+/// </summary>
+public class ClubBackfillResult
+{
+    public required int ClubsCreated { get; set; }
+    public required int TeamsLinked { get; set; }
+}

Club12-Backend/Application/DTOs/Club/Response/ClubHistoryResponse.cs

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+using System;
+using System.Collections.Generic;
+
+namespace Application.DTOs.Club.Response;
+
+/// <summary>
+/// A club's stable identity plus every per-season team that belongs to it.
+/// </summary>
+public class ClubHistoryResponse
+{
+    public required Guid Id { get; set; }
+    public required string Name { get; set; }
+    public required string Slug { get; set; }
+    public string? LogoUrl { get; set; }
+
+    /// <summary>
+    /// The per-season teams that make up this club's history.
+    /// </summary>
+    public required List<ClubTeamSeasonResponse> Teams { get; set; } = [];
+
+    /// <summary>
+    /// The parent institution this club is a squad of, or null when this club has no parent linked.
+    /// </summary>
+    public ClubSummaryResponse? ParentClub { get; set; }
+
+    /// <summary>
+    /// Other squads linked to this club as their parent institution, empty when this club has none.
+    /// </summary>
+    public required List<ClubSummaryResponse> ChildClubs { get; set; } = [];
+}

Club12-Backend/Application/DTOs/Club/Response/ClubSeasonResponse.cs

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+using System;
+
+namespace Application.DTOs.Club.Response;
+
+/// <summary>
+/// One season a club's team participated in.
+/// </summary>
+public class ClubSeasonResponse
+{
+    public required Guid TournamentId { get; set; }
+    public string? TournamentName { get; set; }
+
+    /// <summary>
+    /// Sort key only, not displayed; defaults to the minimum date so unresolved tournaments sort last.
+    /// </summary>
+    public DateTime StartDate { get; set; }
+}

Club12-Backend/Application/DTOs/Club/Response/ClubSummaryResponse.cs

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+using System;
+
+namespace Application.DTOs.Club.Response;
+
+/// <summary>
+/// A minimal club identity, used for pickers and for referencing a related club (parent/child) without pulling in its full season history.
+/// </summary>
+public class ClubSummaryResponse
+{
+    public required Guid Id { get; set; }
+    public required string Name { get; set; }
+    public required string Slug { get; set; }
+    public string? LogoUrl { get; set; }
+}

Club12-Backend/Application/DTOs/Club/Response/ClubTeamSeasonResponse.cs

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+using System;
+using System.Collections.Generic;
+
+namespace Application.DTOs.Club.Response;
+
+/// <summary>
+/// One per-season team row belonging to a club, with the seasons it participated in.
+/// </summary>
+public class ClubTeamSeasonResponse
+{
+    public required Guid TeamId { get; set; }
+    public required string Name { get; set; }
+    public required string Slug { get; set; }
+    public required string ThreeLetterCode { get; set; }
+
+    /// <summary>
+    /// The tournaments this team was registered in, sourced from its registration records.
+    /// </summary>
+    public required List<ClubSeasonResponse> Seasons { get; set; } = [];
+}