Refactor properties and add JsonIgnore for .NET builds

Refactored Receiver and Annotations property declarations for clarity and conciseness. Added [JsonIgnore] attributes to Top and Left properties under .NET builds to exclude them from JSON serialization, using #if NET directives. Replaced previous #if NETFRAMEWORK logic to clarify platform-specific behavior.

EnvelopeGenerator.Domain/Entities/Signature.cs

@@ -4,6 +4,9 @@ using System.ComponentModel;
 using System.ComponentModel.DataAnnotations;
 using System.ComponentModel.DataAnnotations.Schema;
 using EnvelopeGenerator.Domain.Interfaces.Auditing;
+#if NET
+using System.Text.Json.Serialization;
+#endif
 #if NETFRAMEWORK
 using System.Collections.Generic;
 #endif
@@ -109,22 +112,25 @@ namespace EnvelopeGenerator.Domain.Entities
 #if nullable
         ?
 #endif
-            Receiver
-        { get; set; }
+            Receiver { get; set; }
 
         public virtual IEnumerable<ElementAnnotation>
 #if nullable
         ?
 #endif
-            Annotations
-        { get; set; }
+            Annotations { get; set; }
 
-#if NETFRAMEWORK
+#if NET
+        [JsonIgnore]
+#endif
         [NotMapped]
         public double Top => Math.Round(Y, 5);
 
+
+#if NET
+        [JsonIgnore]
+#endif
         [NotMapped]
         public double Left => Math.Round(X, 5);
-#endif
     }
 }