Enhance PDF processing and report integration

Refactor `PdfResultPackageService` to improve PDF handling:
- Load the main document into `PdfDocumentProcessor`.
- Remove original metadata to attribute the result to `DXApp`.
- Replace report file attachment with appending report pages.
- Use a temporary processor to determine report page count.
- Add logging for appended pages and total page count.
- Update save operation to include detailed logging.

Removed the functionality to attach the report file as a PDF attachment.
Improved overall usability, traceability, and document attribution.

DXApp.TemplateKitProject/Services/PdfResultPackageService.cs

@@ -56,7 +56,7 @@ public class PdfResultPackageService(
             converter.SaveDocument(convertedStream);
             convertedStream.Position = 0;
 
-            // Schritt 3: Anhang einbetten
+            // Schritt 3: Hauptdokument laden
             using var processor = new PdfDocumentProcessor();
             processor.LoadDocument(convertedStream);
 
@@ -68,15 +68,23 @@ public class PdfResultPackageService(
             processor.Document.Subject  = string.Empty;
             processor.Document.Keywords = string.Empty;
 
-            processor.AttachFile(new PdfFileAttachment
+            // Schritt 3a: Berichts-Seiten ans Ende anhängen
+            int reportPageCount;
+            using (var reportStream = new FileStream(reportPath, FileMode.Open, FileAccess.Read))
             {
-                FileName = Path.GetFileName(reportPath),
-                Description = "Ergebnisbericht",
-                MimeType = "application/pdf",
-                Relationship = PdfAssociatedFileRelationship.Supplement,
-                CreationDate = DateTime.Now,
-                Data = File.ReadAllBytes(reportPath)
-            });
+                // Temporäres Dokument öffnen um Seitenanzahl zu ermitteln
+                using var tempProcessor = new PdfDocumentProcessor();
+                tempProcessor.LoadDocument(reportStream);
+                reportPageCount = tempProcessor.Document.Pages.Count;
+
+                logger.LogDebug(
+                    "Hänge {PageCount} Seite(n) aus Bericht an das Dokument an.",
+                    reportPageCount);
+
+                // Stream zurücksetzen und ans Hauptdokument anhängen
+                reportStream.Position = 0;
+                processor.AppendDocument(reportStream);
+            }
 
             // Schritt 4: Stempel auf Seite 1 zeichnen
             var firstPage = processor.Document.Pages[0];
@@ -126,10 +134,15 @@ public class PdfResultPackageService(
                     processor.Document.Pages[0], 96, 96);
             }
 
-            // Schritt 4: Speichern
+            // Schritt 5: Speichern
             try
             {
                 processor.SaveDocument(outputPath);
+                
+                logger.LogInformation(
+                    "Result-PDF erstellt mit {TotalPages} Seiten (Original + {ReportPages} Berichtseiten).",
+                    processor.Document.Pages.Count,
+                    reportPageCount);
             }
             catch (Exception ex)
             {