feat(free-battle): add DoMatchingResponseDto

SVSim.EmulatedEntrypoint/Models/Dtos/FreeBattle/DoMatchingResponseDto.cs

@@ -0,0 +1,46 @@
+using System.Text.Json.Serialization;
+using MessagePack;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.FreeBattle;
+
+/// <summary>
+/// Free-battle /do_matching wire response. Identical shape to the rank-battle variant
+/// (see Models/Dtos/RankBattle/DoMatchingResponseDto.cs). The client task class
+/// <c>Wizard/FreeBattleDoMatchingTask.cs</c> shares <c>DoMatchingBase.SettingDoMatchingData()</c>
+/// with rank-battle, so the readable wire surface is identical.
+///
+/// Prod response carries additional <c>room_param</c> / <c>room_id</c> fields
+/// (per traffic_prod_ranked_unlimited.ndjson) that the client does NOT read on this
+/// task path — omitted in v1.
+/// </summary>
+[MessagePackObject(keyAsPropertyName: true)]
+public sealed class DoMatchingResponseDto
+{
+    [JsonPropertyName("matching_state")]
+    [Key("matching_state")]
+    public int MatchingState { get; set; }
+
+    [JsonPropertyName("timeout_period")]
+    [Key("timeout_period")]
+    public int TimeoutPeriod { get; set; } = 60;
+
+    [JsonPropertyName("retry_period")]
+    [Key("retry_period")]
+    public int RetryPeriod { get; set; } = 3;
+
+    [JsonPropertyName("battle_id")]
+    [Key("battle_id")]
+    public string? BattleId { get; set; }
+
+    // Always emitted, even on RETRY. The client's DoMatchingBase.SettingDoMatchingData()
+    // calls .ToString() on this without a Keys.Contains guard, so absence throws
+    // KeyNotFoundException before the matching_state switch runs.
+    [JsonPropertyName("node_server_url")]
+    [JsonIgnore(Condition = JsonIgnoreCondition.Never)]
+    [Key("node_server_url")]
+    public string NodeServerUrl { get; set; } = "";
+
+    [JsonPropertyName("card_master_id")]
+    [Key("card_master_id")]
+    public int? CardMasterId { get; set; }
+}