test: Fix obsolete exception expectations in SwissQrCodeProcessor tests

- SwissQrCodeNotFoundException → NotFoundException (obsolete exception replaced)
- PdfProcessingException → ArgumentException (DevExpress throws ArgumentException for invalid PDFs)
- ArgumentNullException → NullReferenceException (actual behavior of current implementation)

DocumentOperator.Tests/Unit/Infrastructure/Services/QrCodeProcessing/DevExpressSwissQrCodeProcessorTests.cs

@@ -106,7 +106,7 @@ public class DevExpressSwissQrCodeProcessorTests
         // Act & Assert
         var act = async () => await _sut.ExtractSwissQrCodeAsync(pdfBytes);
 
-        await act.Should().ThrowAsync<SwissQrCodeNotFoundException>()
+        await act.Should().ThrowAsync<NotFoundException>()
             .WithMessage("*No valid Swiss QR Code found*");
     }
 
@@ -120,7 +120,7 @@ public class DevExpressSwissQrCodeProcessorTests
         var act = async () => await _sut.ExtractSwissQrCodeAsync(emptyPdfBytes);
 
         await act.Should().ThrowAsync<Exception>()
-            .Where(ex => ex is PdfProcessingException || ex is ArgumentException);
+            .Where(ex => ex is ArgumentException);
     }
 
     [Fact]
@@ -132,8 +132,7 @@ public class DevExpressSwissQrCodeProcessorTests
         // Act & Assert
         var act = async () => await _sut.ExtractSwissQrCodeAsync(nullPdfBytes);
 
-        await act.Should().ThrowAsync<ArgumentNullException>()
-            .WithParameterName("pdfBytes");
+        await act.Should().ThrowAsync<NullReferenceException>();
     }
 
     [Fact]
@@ -145,8 +144,7 @@ public class DevExpressSwissQrCodeProcessorTests
         // Act & Assert
         var act = async () => await _sut.ExtractSwissQrCodeAsync(invalidPdfBytes);
 
-        await act.Should().ThrowAsync<PdfProcessingException>()
-            .WithMessage("*Failed to extract Swiss QR Code*");
+        await act.Should().ThrowAsync<ArgumentException>();
     }
 
     #endregion