fix: restore monthly archive temp file builders

The monthly ZIP job was still being requested normally, but the backend archive task could not create its temp archive files because the helper functions were missing. Restore those builders so the archive task can complete and emit the final generated_archive notification.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

backend/modules/fleet/views.py

@@ -5,6 +5,7 @@ from io import StringIO
 import base64
 import csv
 import mimetypes
+import tempfile
 import threading
 import zipfile
 import re
@@ -2937,6 +2938,25 @@ def _generated_archive_filename_for_user(user, *, year, month, archive_type):
     return f"{prefix}-{month:02d}-{year}-{suffix}.zip"
 
 
+def _build_monthly_archive_to_temp_file(*, user, year, month, archive_type):
+    if archive_type == 'service_tasks':
+        archive_content = _build_monthly_service_tasks_archive_content(user=user, year=year, month=month)
+    else:
+        archive_content = _build_monthly_work_orders_archive_content(user=user, year=year, month=month)
+
+    with tempfile.NamedTemporaryFile(delete=False, suffix='.zip') as temp_file:
+        temp_file.write(archive_content)
+        return Path(temp_file.name)
+
+
+def _build_monthly_service_tasks_archive_to_temp_file(*, user, year, month):
+    return _build_monthly_archive_to_temp_file(user=user, year=year, month=month, archive_type='service_tasks')
+
+
+def _build_monthly_work_orders_archive_to_temp_file(*, user, year, month):
+    return _build_monthly_archive_to_temp_file(user=user, year=year, month=month, archive_type='work_orders')
+
+
 def _unique_zip_entry_name(entry_name, used_names):
     candidate = entry_name
     entry_path = Path(entry_name)