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/0001_initial.py

@@ -0,0 +1,29 @@
+from pathlib import Path
+
+from django.db import connection, migrations
+
+from . import LEGACY_SCHEMA_VERSION
+from ._migrations import get_schema_version, set_schema_version
+
+here = Path(__file__).resolve().parent
+
+
+def create_schema(_apps, _schema_editor):
+    schema_version = get_schema_version()
+
+    # A schema already exists, don't overwrite !
+    if schema_version is not None:
+        return
+
+    with connection.cursor() as cursor:
+        for migration_filename in ("schema.sql", "data.sql"):
+            raw = (here / "sql" / migration_filename).read_text(encoding="utf-8")
+            cursor.execute(raw)
+
+            set_schema_version(cursor, LEGACY_SCHEMA_VERSION)
+
+
+class Migration(migrations.Migration):
+    initial = True
+    dependencies = []
+    operations = [migrations.RunPython(create_schema)]