feat(dto): TK2 common DTOs (entry/class/deck/candidate/results/reward)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

SVSim.EmulatedEntrypoint/Models/Dtos/Common/ArenaTwoPick/BattleResultsDto.cs

@@ -0,0 +1,15 @@
+using System.Text.Json.Serialization;
+using MessagePack;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Common.ArenaTwoPick;
+
+[MessagePackObject]
+public class BattleResultsDto
+{
+    /// <summary>Each entry is 0 (loss) or 1 (win). Native int array — matches capture.</summary>
+    [JsonPropertyName("result_list")] [Key("result_list")]
+    public List<int> ResultList { get; set; } = new();
+
+    [JsonPropertyName("win_count")] [Key("win_count")]
+    public int WinCount { get; set; }
+}