fix(FlangeDlg): 修正 GetEndF1/GetEndF2 端面取值下标

- CFlangeDlg::GetEndF1/GetEndF2 原先取 m_arFlangeVals 下标 0/1（公称直径/法兰外径），
  端面型式实际在下标 5/6，导致 PIPE_FLANGF 被写成 DN 字符串
- 改为下标 5/6，且为空时回退 "FF"

SourceCode/Code2026/PipelineCmd/FlangeDlg.cpp

@@ -312,15 +312,16 @@ void CFlangeDlg::SetAdoDb(CUIISQLiteServer *pDb)
 
 void CFlangeDlg::GetEndF1(CString &sEndF)
 {
+	//端面型式在 m_arFlangeVals 的下标 5（0公称直径 1法兰外径 2法兰高度 3法兰厚度 4法兰颈 5端面1 6端面2）
 	sEndF = _T("FF");
-	if (m_arFlangeVals.GetSize() > 0)
-		sEndF = m_arFlangeVals.GetAt(0);
+	if (m_arFlangeVals.GetSize() > 5 && !m_arFlangeVals.GetAt(5).IsEmpty())
+		sEndF = m_arFlangeVals.GetAt(5);
 }
 void CFlangeDlg::GetEndF2(CString &sEndF)
 {
 	sEndF = _T("FF");
-	if (m_arFlangeVals.GetSize() > 1)
-		sEndF = m_arFlangeVals.GetAt(1);
+	if (m_arFlangeVals.GetSize() > 6 && !m_arFlangeVals.GetAt(6).IsEmpty())
+		sEndF = m_arFlangeVals.GetAt(6);
 }