feat(config): add ArenaTwoPickConfig section

SVSim.Database/Models/Config/ArenaTwoPickConfig.cs

@@ -0,0 +1,30 @@
+namespace SVSim.Database.Models.Config;
+
+/// <summary>
+/// Take Two run mechanics: rarity weights, class/neutral mix, per-battle XP, season ids,
+/// allowed-class allow-list. The pool's set scoping lives on <see cref="ChallengeConfig"/>;
+/// this section is purely mechanics + the reward-schedule/challenge ids stamped on each run.
+/// </summary>
+[ConfigSection("ArenaTwoPick")]
+public class ArenaTwoPickConfig
+{
+    public int RewardScheduleId { get; set; } = 1;
+    public int ChallengeId { get; set; } = 1;
+    public int MaxLosses { get; set; } = 2;
+    public int ClassXpPerBattle { get; set; } = 100;
+    public int SpotPointsPerBattle { get; set; } = 10;
+
+    public double LegendaryRate { get; set; } = 0.06;
+    public double GoldRate { get; set; } = 0.17;
+    public double SilverRate { get; set; } = 0.33;
+    public double BronzeRate { get; set; } = 0.44;
+
+    public double NeutralMixRate { get; set; } = 0.25;
+
+    public List<int> AllowedClassIds { get; set; } = new();
+
+    public static ArenaTwoPickConfig ShippedDefaults() => new()
+    {
+        AllowedClassIds = new List<int> { 1, 2, 3, 4, 5, 6, 7, 8 },
+    };
+}