feat(bp): /battle_pass/info response DTOs — string-typed wire numerics

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

SVSim.EmulatedEntrypoint/Models/Dtos/BattlePass/BattlePassRewardListDto.cs

@@ -0,0 +1,14 @@
+using MessagePack;
+using System.Text.Json.Serialization;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.BattlePass;
+
+/// <summary>Wrapper for one track's reward array: <c>{ "reward": [ ... ] }</c>.</summary>
+[MessagePackObject]
+public class BattlePassRewardListDto
+{
+    [JsonPropertyName("reward")]
+    [Key("reward")]
+    [JsonIgnore(Condition = JsonIgnoreCondition.Never)]
+    public List<BattlePassRewardDto> Reward { get; set; } = new();
+}