fix: Add django.setup() to deploy script plugin seeding

The python -c one-liner wasn't initializing Django's app registry,
causing AppRegistryNotReady error when calling get_tenant_model().

deploy.sh

@@ -184,6 +184,8 @@ if [[ "$SKIP_MIGRATE" != "true" ]]; then
 
     echo ">>> Seeding/updating platform plugins for all tenants..."
     docker compose -f docker-compose.production.yml exec -T django sh -c 'export DATABASE_URL=postgres://\${POSTGRES_USER}:\${POSTGRES_PASSWORD}@\${POSTGRES_HOST}:\${POSTGRES_PORT}/\${POSTGRES_DB} && python -c "
+import django
+django.setup()
 from django_tenants.utils import get_tenant_model
 from django.core.management import call_command
 Tenant = get_tenant_model()