refactor: 代码格式统一和Excel导出优化

main.py

@@ -838,7 +838,8 @@ def export_all_scenarios_to_excel(results, filename):
     :param filename: 输出文件路径
     """
     try:
-        with pd.ExcelWriter(filename) as writer:
+        # 使用 openpyxl 引擎以便后续写入单元格
+        with pd.ExcelWriter(filename, engine='openpyxl') as writer:
             # 1. 总览 Sheet
             summary_data = []
             for res in results:
@@ -882,7 +883,13 @@ def export_all_scenarios_to_excel(results, filename):
                         'Cost (¥)': conn['cable']['cost']
                     })
                 df = pd.DataFrame(data)
-                df.to_excel(writer, sheet_name=safe_name, index=False)
+                
+                # 从第 2 行开始写入数据（startrow=1，Excel中为第2行），留出第 1 行写标题
+                df.to_excel(writer, sheet_name=safe_name, index=False, startrow=1)
+                
+                # 在第一行写入方案名称
+                ws = writer.sheets[safe_name]
+                ws.cell(row=1, column=1, value=f"Scenario: {res['name']}")
                 
         print(f"成功导出包含所有方案的Excel文件: {filename}")
     except Exception as e: