Erste lauffähige Version

app/mailmerge/services/pdf_merge.py

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+from pathlib import Path
+
+from pypdf import PdfWriter
+
+
+def merge_pdfs(pdfs: list[Path], out_path: Path) -> Path:
+    writer = PdfWriter()
+    for pdf in pdfs:
+        writer.append(str(pdf))
+    out_path.parent.mkdir(parents=True, exist_ok=True)
+    with out_path.open("wb") as f:
+        writer.write(f)
+    writer.close()
+    return out_path