Add owner role and admin management controls

Domain/Player.cs

@@ -20,6 +20,7 @@ public class Player
 
     public DateTimeOffset? LastLoginAt { get; set; }
     public bool IsAdmin { get; set; }
+    public bool IsOwner { get; set; }
     public Phase CurrentPhase { get; set; } = Phase.Suggest;
     public bool VotesFinal { get; set; }
     public bool HasJoker { get; set; }