Update to dotnet 9.0, add user roles, MatchStats and OpenApi/Scalar in dev

LaDOSE.Src/LaDOSE.DTO/ApplicationUserDTO.cs

@@ -1,5 +1,6 @@
 
 using System;
+using System.Collections.Generic;
 
 namespace LaDOSE.DTO
 {
@@ -9,8 +10,13 @@ namespace LaDOSE.DTO
         public string FirstName { get; set; }
         public string LastName { get; set; }
         public string Username { get; set; }
+
+        /// <summary>Only ever read from a request; never populated on a response.</summary>
         public string Password { get; set; }
 
+        /// <summary>Role names held by the user, e.g. <c>["Admin"]</c>. Empty means a plain user.</summary>
+        public List<string> Roles { get; set; }
+
         public string Token { get; set; }
         public DateTime Expire { get; set; }
     }