Registration rework

+ InvitesRepository
+ AdminsRepository
+ rework jwt

Govor.Core/Models/Invitation.cs

@@ -0,0 +1,11 @@
+namespace Govor.Core.Models;
+
+public class Invitation
+{
+    public Guid Id { get; set; }
+    public bool IsAdmin { get; set; }
+    public DateTime DateCreated { get; set; }
+    public DateTime EndDate { get; set; }
+    public int MaxParticipants { get; set; }
+    public List<User> Users { get; set; } = new List<User>();
+}