feat(SaveDocStatusCommand): enhance SaveDocStatusCommandHandler with flexible envelope & receiver filters

- Added support for filtering by Envelope.Id or Envelope.Uuid
- Added support for filtering by Receiver.Id, Receiver.EmailAddress, or Receiver.Signature
- Throw BadRequestException when required identifiers are missing
- Updated repository queries to combine envelope and receiver filters

EnvelopeGenerator.Domain/Entities/DocumentStatus.cs

@@ -41,6 +41,12 @@ public class DocumentStatus
 
     [Column("VALUE", TypeName = "nvarchar(max)")]
     public string Value { get; set; }
+
+    [ForeignKey("EnvelopeId")]
+    public virtual Envelope Envelope { get; set; }
+
+    [ForeignKey("ReceiverId")]
+    public virtual Receiver Receiver { get; set; }
 }
 
 #if NETFRAMEWORK