Add support for magazines, backend only (#53)

* Initial work to support magazines

* Change editor default height to 300px from 500px

* Stabilize the magazine repository app

* Switch from stacked to tabular inlines for magazines

* Update submodules

ram/repository/migrations/0004_magazineissuedocument.py

@@ -0,0 +1,65 @@
+# Generated by Django 6.0 on 2025-12-08 17:47
+
+import django.db.models.deletion
+import ram.utils
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("bookshelf", "0025_magazine_magazineissue"),
+        (
+            "repository",
+            "0003_alter_bookdocument_file_alter_catalogdocument_file_and_more",
+        ),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="MagazineIssueDocument",
+            fields=[
+                (
+                    "id",
+                    models.BigAutoField(
+                        auto_created=True,
+                        primary_key=True,
+                        serialize=False,
+                        verbose_name="ID",
+                    ),
+                ),
+                ("description", models.CharField(blank=True, max_length=128)),
+                (
+                    "file",
+                    models.FileField(
+                        storage=ram.utils.DeduplicatedStorage, upload_to="files/"
+                    ),
+                ),
+                ("creation_time", models.DateTimeField(auto_now_add=True)),
+                ("updated_time", models.DateTimeField(auto_now=True)),
+                (
+                    "private",
+                    models.BooleanField(
+                        default=False,
+                        help_text="Document will be visible only to logged users",
+                    ),
+                ),
+                (
+                    "issue",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.CASCADE,
+                        related_name="document",
+                        to="bookshelf.magazineissue",
+                    ),
+                ),
+            ],
+            options={
+                "verbose_name_plural": "Magazines documents",
+                "constraints": [
+                    models.UniqueConstraint(
+                        fields=("issue", "file"), name="unique_issue_file"
+                    )
+                ],
+            },
+        ),
+    ]