Update app.py

app.py

@@ -493,7 +493,7 @@ if mode == "是":
         if backward_index < len(backward_additional_questions):
             k, prompt_text = backward_additional_questions[backward_index]
             backward_index += 1
-            return prompt_text
+        return prompt_text
         else:
             # 已完成背景收集，生成路径分析
             strategy = backward_strategy_plan(