feat: complete multimodal ticket intake

backend/apps/tickets/tasks.py

@@ -18,13 +18,13 @@ def execute_ticket_draft_analysis(draft_id: int, run_id: int) -> None:
 def cleanup_expired_ticket_drafts() -> int:
     queryset = TicketDraft.objects.filter(
         expires_at__lt=timezone.now(), confirmed_ticket__isnull=True
-    ).prefetch_related("images")
+    ).prefetch_related("materials")
     count = queryset.count()
     for draft in queryset:
         public_id = str(draft.public_id)
-        for image in draft.images.all():
+        for material in draft.materials.all():
             try:
-                delete_object(image.storage_path)
+                delete_object(material.storage_path)
             except Exception:
                 pass
         OperationAuditLog.objects.create(
@@ -36,7 +36,7 @@ def cleanup_expired_ticket_drafts() -> int:
             request_snapshot={
                 "status": draft.status,
                 "guided_rounds": draft.guided_rounds,
-                "image_count": draft.images.count(),
+                "material_count": draft.materials.count(),
             },
             result="success",
         )