fix: heatmap_path 提前声明避免水色指数模式下 UnboundLocalError

src/postprocessing/report_word.py

@@ -1784,10 +1784,10 @@ class WaterQualityReportGenerator:
         doc.add_paragraph()  # 表格和热力图之间的空行
         
         # 2. 添加相关性热力图（放在表格下方）—— 仅 ML 模式
+        heatmap_path = vis_dir / "correlation_heatmap.png"
         if getattr(self, '_pipeline_mode', 'ml') == 'ml':
             h3 = doc.add_heading("4.2 水质参数相关性分析", level=2)
             self._style_heading(h3, level=2)
-            heatmap_path = vis_dir / "correlation_heatmap.png"
             figure_num = start_figure_num
             if heatmap_path.exists():
                 try:
@@ -1827,7 +1827,9 @@ class WaterQualityReportGenerator:
             pass
         
         doc.add_page_break()
-        return start_figure_num + (1 if heatmap_path.exists() else 0)
+        heatmap_added = 1 if (getattr(self, '_pipeline_mode', 'ml') == 'ml'
+                               and heatmap_path.exists()) else 0
+        return start_figure_num + heatmap_added
 
     def _add_physical_inversion_section(
         self,