feat(EnvelopeReceiverReadOnly): Controller initialisieren

- Join mit Receiver und Read
 - DI-Konfiguration hinzufügen
 - Auslöser hinzufügen (TBSIG_ENVELOPE_RECEIVER_READ_ONLY_UPD)

EnvelopeGenerator.Application/DTOs/EnvelopeReceiverReadOnly/EnvelopeReceiverReadOnlyCreateDto.cs

@@ -1,11 +1,15 @@
-namespace EnvelopeGenerator.Application.DTOs.EnvelopeReceiverReadOnly
+using System.Text.Json.Serialization;
+
+namespace EnvelopeGenerator.Application.DTOs.EnvelopeReceiverReadOnly
 {
     public record EnvelopeReceiverReadOnlyCreateDto(
         long EnvelopeId,
         string ReceiverMail,
-        DateTime DateValid,
-        string AddedWho)
+        DateTime DateValid)
     {
+        [JsonIgnore]
+        public string? AddedWho { get; set; }
+
         public DateTime AddedWhen { get; } = DateTime.Now;
     };
 }