feat: replace php migration with django migration

- keep latest legacy version in initial migration file
- move propel schema to api legacy app
- remove legacy upgrade tool

api/libretime_api/legacy/migrations/0009_2_5_11.py

@@ -0,0 +1,33 @@
+from django.db import migrations
+
+from ._migrations import legacy_migration_factory
+
+UP = None
+
+DOWN = None
+
+
+def update_disk_usage(cursor):
+    cursor.execute(
+        """
+        UPDATE cc_pref SET valstr = (
+            SELECT SUM(filesize)
+            FROM cc_files
+        )
+        WHERE keystr = 'disk_usage';
+        """
+    )
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("legacy", "0008_2_5_10"),
+    ]
+    operations = [
+        migrations.RunPython(
+            code=legacy_migration_factory(
+                target="2.5.11",
+                sql=update_disk_usage,
+            )
+        )
+    ]