Refactor FinancialInvoice class to simplify properties

Removed `SmsCode`, `FinancialStatementId`, and `FinancialStatement` properties, along with their associated methods (`SetFinancialStatement` and `SetNewSmsCode`).

Added a new `InvoiceId` property of type `Guid` to serve as a unique identifier for invoices. Updated the constructor to initialize `InvoiceId` and removed the `SmsCode` initialization logic.

These changes streamline the `FinancialInvoice` class and improve its alignment with application requirements.

Company.Domain/FinancialInvoiceAgg/FinancialInvoice.cs

@@ -13,9 +13,8 @@ public class FinancialInvoice:EntityBase
     public FinancialInvoiceStatus Status { get; private set; }
     public DateTime? PaidAt { get; private set; }
     public double Amount { get; private set; }
-    public string SmsCode { get; private set; }
-    public long? FinancialStatementId { get; private set; }
-    public FinancialStatment FinancialStatement { get; private set; }
+    public Guid InvoiceId { get; private set; }
+
 
     public FinancialInvoice(int month, int year, FinancialInvoiceStatus status, double amount)
     {
@@ -23,11 +22,7 @@ public class FinancialInvoice:EntityBase
         Year = year;
         Status = status;
         Amount = amount;
-        SmsCode = Guid.NewGuid().ToString("N");
-    }
-    public void SetFinancialStatement(long financialStatementId)
-    {
-        FinancialStatementId = financialStatementId;
+        InvoiceId = Guid.NewGuid();
     }
     public void SetPaid(DateTime paidAt)
     {
@@ -49,10 +44,6 @@ public class FinancialInvoice:EntityBase
         Status = FinancialInvoiceStatus.Refunded;
         PaidAt = null;
     }
-    public void SetNewSmsCode()
-    {
-        SmsCode = Guid.NewGuid().ToString("N");
-    }
 
 }