修正子程序调用：用RunSpAsync传Dictionary参数，窗口不关闭

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CamScanner.cs

@@ -1043,9 +1043,9 @@ public class ScannerForm : Form
             lblStatus.Text = string.Format("完成！已保存: {0}", Path.GetFileName(outputPath));
 
             // 调用子程序 "over"，传参 files 为输出文件路径
-            _context.SetVarValue("files", outputPath);
+            var param = new Dictionary<string, object>();
-            _context.SetVarValue("over", true);
+            param.Add("files", outputPath);
-            this.Close();
+            _context.RunSpAsync("over", param);
         }
         catch (Exception ex)
         {