fix: printing job admin auto complete for product field

printing/admin.py

@@ -368,6 +368,13 @@ class PrintingJobAdmin(admin.ModelAdmin):
     )
     list_filter = ('created_at', 'printing_order__customer__name')
     actions = ['advance_to_next_state_action', 'step_back_one_state_action', 'reset_progress_action']
+    autocomplete_fields = (
+        'merchant',
+        'printing_order',
+        'product',
+        'business_object',
+        'created_by',
+    )
 
     def save_model(self, request, obj, form, change):
         """保存 PrintingJob 时使用 service 层"""