fixes, orval, downloader functioning again

backend/configuration/management/commands/seed_app_config.py

@@ -0,0 +1,20 @@
+from decimal import Decimal
+from django.core.management.base import BaseCommand
+from configuration.models import SiteConfiguration, VATRate
+
+
+class Command(BaseCommand):
+    help = "Ensure SiteConfiguration singleton and default VAT rates exist."
+
+    def handle(self, *args, **kwargs):
+        config, created = SiteConfiguration.objects.get_or_create(pk=1)
+        if created:
+            self.stdout.write(self.style.SUCCESS("Created default SiteConfiguration."))
+        else:
+            self.stdout.write("SiteConfiguration already exists.")
+
+        if not VATRate.objects.filter(is_active=True).exists():
+            VATRate.objects.create(name="Standard", rate=Decimal('21.0000'), is_default=True, is_active=True)
+            self.stdout.write(self.style.SUCCESS("Created default VAT rate (21%)."))
+        else:
+            self.stdout.write("VAT rates already exist.")