Step5 输出文件名统一为 processed_data.csv（修复 GUI/算法断链）

实际落盘（data_preparation_step.py:32、runner.py:101）一直为 processed_data.csv，但 GUI 三处残留旧名 cleaned_sampling_data.csv：注册表 step_default_outputs['step5_clean']、面板占位符、默认输出路径生成。本次统一替换，与 PipelineRunner/算法真实产物对齐。

src/gui/panels/step5_clean_panel.py

@@ -76,7 +76,7 @@ class Step5CleanPanel(QWidget):
             "输出处理后CSV:",
             "CSV Files (*.csv);;All Files (*.*)"
         )
-        self.output_file.line_edit.setPlaceholderText("cleaned_sampling_data.csv")
+        self.output_file.line_edit.setPlaceholderText("processed_data.csv")
         layout.addWidget(self.output_file)
 
         # 启用步骤
@@ -129,7 +129,7 @@ class Step5CleanPanel(QWidget):
         if self.work_dir:
             output_dir = os.path.join(self.work_dir, "5_Data_Cleaning")
             os.makedirs(output_dir, exist_ok=True)
-            default_output_path = os.path.join(output_dir, "cleaned_sampling_data.csv").replace('\\', '/')
+            default_output_path = os.path.join(output_dir, "processed_data.csv").replace('\\', '/')
             self.output_file.set_path(default_output_path)
         else:
             self.output_file.set_path("")

src/gui/water_quality_gui.py

@@ -1369,7 +1369,7 @@ class WaterQualityGUI(QMainWindow):
             'step2': "2_Glint_Detection/severe_glint_area.dat",
             'step3': "3_deglint/deglint_kutser.bsq",
             'step4_sampling': "4_sampling/sampling_spectra.csv",
-            'step5_clean': "5_Data_Cleaning/cleaned_sampling_data.csv",
+            'step5_clean': "5_Data_Cleaning/processed_data.csv",
             'step6_feature': "6_Spectral_Feature_Extraction/training_spectra.csv",
             'step7_index': "7_Water_Quality_Indices/training_spectra_indices.csv",
             'step8_ml_train': "8_Supervised_Model_Training/",