add oauth2 to client

MareSynchronos/MareConfiguration/Models/Authentication.cs

@@ -6,4 +6,5 @@ public record Authentication
     public string CharacterName { get; set; } = string.Empty;
     public uint WorldId { get; set; } = 0;
     public int SecretKeyIdx { get; set; } = -1;
+    public string? UID { get; set; }
 }

MareSynchronos/MareConfiguration/Models/ServerStorage.cs

@@ -8,4 +8,6 @@ public class ServerStorage
     public Dictionary<int, SecretKey> SecretKeys { get; set; } = [];
     public string ServerName { get; set; } = string.Empty;
     public string ServerUri { get; set; } = string.Empty;
+    public bool UseOAuth2 { get; set; } = false;
+    public string? OAuthToken { get; set; } = null;
 }