Add EnvelopeTypeId to EmailData and dynamic signature type

Introduced EnvelopeTypeId as a read-only property in EmailData, set during construction. Updated TemplateService.InitDictionary to use EnvelopeTypeId for determining signature type and message content, replacing the hardcoded [SIGNATURE_TYPE] value. Also added necessary imports for domain entities and constants.

EnvelopeGenerator.CommonServices/Models/EmailData.vb

@@ -22,6 +22,8 @@ Public Class EmailData
     Public Property ATT1_REL_TYPE As String = ""
     Public Property ADDED_WHO_PROCESS As String = "DDEnvelopGenerator"
 
+    Public ReadOnly Property EnvelopeTypeId As Integer = 0
+
     ''' <summary>
     ''' Constructor for sending email to receiver
     ''' </summary>
@@ -41,6 +43,7 @@ Public Class EmailData
         SenderAdress = pEnvelope.User.Email
         SenderName = pEnvelope.User.GetFullName()
         EnvelopeTitle = pEnvelope.Title
+        EnvelopeTypeId = pEnvelope.EnvelopeTypeId
     End Sub
     Public Function TextToHtml(input As String) As String
         If String.IsNullOrEmpty(input) Then Return ""
@@ -77,6 +80,7 @@ Public Class EmailData
         SenderAdress = pEnvelope.User.Email
         SenderName = pEnvelope.User.GetFullName()
         EnvelopeTitle = pEnvelope.Title
+        EnvelopeTypeId = pEnvelope.EnvelopeTypeId
     End Sub
 
 End Class