Refactor notification and email handling

Refactored `DocumentReceivedNotification` to use new properties `Origin`, `EnvelopeUuid`, and `ReceiverSignature` for constructing `EnvelopeURL`. Updated `LinkToDocument` and `LinkToDocumentText` to derive from `EnvelopeURL`.

Simplified `CreateEnvelopeCommandHandler` with record-like syntax, removing private fields and directly injecting dependencies.

Renamed and refactored `QueueInvitationEmailsAsync` to `SendInvitationEmailsAsync`, using `EnvNtfService.Notify` for email notifications, centralizing logic and improving clarity.

Improved error handling in email sending with logging. Updated variable names for clarity and cleaned up `using` directives.

EnvelopeGenerator.Application/Common/Interfaces/Services/Notification/DocumentReceivedNotification.cs

@@ -1,4 +1,5 @@
-using EnvelopeGenerator.Domain.Constants;
+using EnvelopeGenerator.Application.Common.Extensions;
+using EnvelopeGenerator.Domain.Constants;
 
 namespace EnvelopeGenerator.Application.Common.Interfaces.Services.Notification;
 
@@ -45,12 +46,36 @@ public record DocumentReceivedNotification : EnvelopeNotificationBase
     /// <summary>
     /// 
     /// </summary>
-    public required string LinkToDocument { get; init; }
+    public required Uri Origin { private get; init; }
 
     /// <summary>
     /// 
     /// </summary>
-    public string LinkToDocumentText => LinkToDocument[..Math.Min(LinkToDocument.Length, 40)];
+    public required string EnvelopeUuid { private get; init; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public required string ReceiverSignature { private get; init; }
+
+    private Uri EnvelopeURL => new(Origin, $"Envelope/{(EnvelopeUuid, ReceiverSignature).ToEnvelopeKey()}");
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public string LinkToDocument => EnvelopeURL.AbsoluteUri;
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public string LinkToDocumentText
+    {
+        get
+        {
+            var urlText = EnvelopeURL.ToString();
+            return $"{urlText[..Math.Min(urlText.Length, 40)]}..";
+        }
+    }
 
     /// <summary>
     ///