refactor(Receiver): TotpSecretkey und TotpExpiration Eigenschaften zu Entity und DTOs hinzugefügt.

EnvelopeGenerator.Domain/Entities/Receiver.cs

@@ -24,6 +24,12 @@ namespace EnvelopeGenerator.Domain.Entities
         [Column("ADDED_WHEN", TypeName = "datetime")]
         public DateTime AddedWhen { get; set; }
 
+        [Column("TOTP_SECRET_KEY", TypeName = "nvarchar(MAX)")]
+        public string? TotpSecretkey { get; set; }
+
+        [Column("TOTP_SECRET_KEY", TypeName = "datetime")]
+        public DateTime? TotpExpiration { get; set; }
+
         public IEnumerable<EnvelopeReceiver>? EnvelopeReceivers { get; init; }
     }
 }