Implement exchange imports and frontend reporting APIs

tests/apps/registers/test_services.py

@@ -5,13 +5,14 @@ from __future__ import annotations
 import io
 from datetime import date
 
-from apps.organization.models import Organization
-from apps.registers.models import Register, RegisterUpload, RegistryMembershipPeriod
-from apps.registers.services import RegisterImportService
 from django.core.files.uploadedfile import SimpleUploadedFile
 from django.test import TestCase
 from openpyxl import Workbook
 
+from apps.organization.models import Organization
+from apps.registers.models import Register, RegisterUpload, RegistryMembershipPeriod
+from apps.registers.services import RegisterImportService
+
 
 def build_registry_upload(name: str, rows: list[dict[str, str]]) -> SimpleUploadedFile:
     """Build an in-memory xlsx with register headers for snapshot import."""