Enhancement: add layout options for email conversion (#8907)

---------

Co-authored-by: shamoon <4887959+shamoon@users.noreply.github.com>

src/paperless_mail/migrations/0029_mailrule_pdf_layout.py

@@ -0,0 +1,28 @@
+# Generated by Django 5.1.3 on 2024-11-24 12:39
+
+from django.db import migrations
+from django.db import models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("paperless_mail", "0028_alter_mailaccount_password_and_more"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="mailrule",
+            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=0,
+                verbose_name="pdf layout",
+            ),
+        ),
+    ]