[papers] Fix scrobbling of academic papers

vrobbler/apps/books/migrations/0038_paper_pdf_file.py

@@ -0,0 +1,18 @@
+# Generated by Django 4.2.29 on 2026-06-23 14:45
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("books", "0037_book_volume_book_volume_comicvine_id"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="paper",
+            name="pdf_file",
+            field=models.FileField(blank=True, null=True, upload_to="papers/pdf/"),
+        ),
+    ]