Feat: Add default PDF layout option as fallback to ENV

src/paperless_mail/migrations/0029_mailrule_pdf_layout.py

@@ -15,12 +15,13 @@ class Migration(migrations.Migration):
             name="pdf_layout",
             field=models.PositiveIntegerField(
                 choices=[
+                    (0, "System default"),
                     (1, "Text, then HTML"),
                     (2, "HTML, then text"),
                     (3, "HTML only"),
                     (4, "Text only"),
                 ],
-                default=1,
+                default=0,
                 verbose_name="pdf layout",
             ),
         ),

src/paperless_mail/models.py

@@ -116,6 +116,7 @@ class MailRule(document_models.ModelWithOwner):
         EVERYTHING = 2, _("Process all files, including 'inline' attachments.")
 
     class PdfLayout(models.IntegerChoices):
+        DEFAULT = 0, _("System default")
         TEXT_HTML = 1, _("Text, then HTML")
         HTML_TEXT = 2, _("HTML, then text")
         HTML_ONLY = 3, _("HTML only")