fix: use task work order data in service report context

Ensure /putni-nalozi/racuni reads service-report context from the selected task's own work order instead of reusing the parent page work-order data for every task.

- task-service-context now returns task_work_order metadata per task
- work hours modal reads location and travel data from task_work_order
- tasks without a linked work order fall back to None

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

backend/modules/fleet/views.py

@@ -3464,6 +3464,22 @@ class WorkOrderViewSet(viewsets.ModelViewSet):
                 'service_report_note': task.service_report_note or '',
                 'assigned_to_name': _user_display_name(task.assigned_to),
                 'vehicle_registration': getattr(task.vehicle, 'registration_number', None),
+                'task_work_order': (
+                    {
+                        'id': task.work_order_id,
+                        'display_code': getattr(task.work_order, 'display_code', None),
+                        'origin_location': getattr(task.work_order, 'origin_location', None),
+                        'location': getattr(task.work_order, 'location', None),
+                        'travel_start_at': getattr(task.work_order, 'travel_start_at', None),
+                        'travel_end_at': getattr(task.work_order, 'travel_end_at', None),
+                        'start_mileage': getattr(task.work_order, 'start_mileage', None),
+                        'end_mileage': getattr(task.work_order, 'end_mileage', None),
+                        'distance': getattr(task.work_order, 'distance', None),
+                        'servicer_vehicle_registration': getattr(task.work_order, 'servicer_vehicle_registration', None),
+                        'servicer_vehicle_make_model': getattr(task.work_order, 'servicer_vehicle_make_model', None),
+                    }
+                    if task.work_order_id else None
+                ),
                 'work_hours_table': getattr(getattr(task, 'work_hours_table', None), 'data', None),
                 'service_records': records_payload,
             })