DTOs for index mostly done, doing DB models

SVSim.EmulatedEntrypoint/Models/Dtos/ArenaConfig.cs

@@ -0,0 +1,12 @@
+using MessagePack;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos;
+
+[MessagePackObject]
+public class ArenaConfig
+{
+    [Key("use_challenge_two_pick_premium_card")]
+    public int UseChallengePickTwoPremiumCard { get; set; }
+    [Key("challenge_two_pick_sleeve_id")]
+    public int ChallengePickTwoCardSleeve { get; set; }
+}