feat: Add new unit tests, domain exceptions, documentation, and various build artifacts across multiple services.

services/fnb-engine-net/src/FnbEngine.Domain/Exceptions/SampleDomainException.cs

@@ -0,0 +1,21 @@
+namespace MyService.Domain.Exceptions;
+
+/// <summary>
+/// EN: Exception for Sample aggregate domain errors.
+/// VI: Exception cho các lỗi domain của Sample aggregate.
+/// </summary>
+public class SampleDomainException : DomainException
+{
+    public SampleDomainException()
+    {
+    }
+
+    public SampleDomainException(string message) : base(message)
+    {
+    }
+
+    public SampleDomainException(string message, Exception innerException) 
+        : base(message, innerException)
+    {
+    }
+}