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

LaDOSE.Src/LaDOSE.DTO/EventDTO.cs

@@ -1,8 +1,13 @@
-namespace LaDOSE.DTO
+using System;
+
+namespace LaDOSE.DTO
 {
     public class EventDTO
     {
         public int Id { get; set; }
         public string Name { get; set; }
+
+        /// <summary>Event date, mapped by convention from Event.Date. Used for time-series charts.</summary>
+        public DateTime Date { get; set; }
     };
 }