Implement d6 wild dice/fumble skills and die-state rolls

RpgRoller/Domain/GameModels.cs

@@ -52,6 +52,8 @@ public sealed class Skill
     public required Guid CharacterId { get; set; }
     public required string Name { get; set; }
     public required string DiceRollDefinition { get; set; }
+    public required int WildDice { get; set; }
+    public required bool AllowFumble { get; set; }
 }
 
 public sealed class RollLogEntry