fix: 水池截面中转文件 JMSJ.sat 按进程隔离，补临时文件命名文档

JMDBDlg、JMSJDlg、HZQTDlg 共 7 处共用固定的 JMSJ.sat，两个 CAD 实例
同时运行时会互相覆盖，acisIn 可能读到另一个实例写的截面。

新增 Pool3dCmd/PoolSectionTemp.h 的 GetPoolSectionSatPath()，文件名改为
JMSJ_<pid>.sat。同一进程内所有调用点路径一致，acisOut 写、ShowLastSection
读的隐式链路不受影响；进程之间用 PID 隔离。顺带去掉无意义的 MakeLower。

同时新增 temp-file-naming.md，记录临时文件命名规则、全库现状，以及
DGJM.sat 已废弃、不再改造的结论。

SourceCode/Code2026/Pool3dCmd/HZQTDlg.cpp

@@ -4,6 +4,7 @@
 #include "JMSJDlg.h"
 #include "GLTKDlg.h"
 #include "KTSetting.h"
+#include "PoolSectionTemp.h"
 
 DLLIMPEXP CString IDCreate();
 
@@ -270,9 +271,7 @@ void CHZQTDlg::OnBnClickedCheck1()
 			CString sScr;
 			if (dlg.GetCrossSectionScr(sScr))
 			{
-				CString sFullPath = FilePath::GetSysDir();
-				sFullPath.MakeLower();
-				sFullPath += _T("\\JMSJ.sat");
+				CString sFullPath = GetPoolSectionSatPath(FilePath::GetSysDir());
 
 				CStdioFile file;
 				if (file.Open(sFullPath,CFile::modeCreate |CFile::modeWrite ))
@@ -394,9 +393,7 @@ void CHZQTDlg::SetFromWall(AcDbObjectId& id)
 				m_bUserDefSec = TRUE;
 				pWall->GetSpecialtyData(AcDb::kForRead)->GetAt(KEY_SECTIONSCR,m_sRegScr);
 
-				CString sFullPath = FilePath::GetSysDir();
-				sFullPath.MakeLower();
-				sFullPath += _T("\\JMSJ.sat");
+				CString sFullPath = GetPoolSectionSatPath(FilePath::GetSysDir());
 
 				CStdioFile file;
 				if (file.Open(sFullPath,CFile::modeCreate |CFile::modeWrite ))

SourceCode/Code2026/Pool3dCmd/JMDBDlg.cpp

@@ -3,6 +3,7 @@
 #include "JMDBDlg.h"
 #include "GLTKDlg.h"
 #include "CoreTools.h"
+#include "PoolSectionTemp.h"
 
 IMPLEMENT_DYNAMIC(CJMDBDlg, CDialog)
 
@@ -87,9 +88,7 @@ void CJMDBDlg::OnBnClickedButton1()
 		CString sScr;
 		if (dlg.GetCrossSectionScr(sScr))
 		{
-			CString sFullPath = FilePath::GetSysDir();
-			sFullPath.MakeLower();
-			sFullPath += _T("\\JMSJ.sat");
+			CString sFullPath = GetPoolSectionSatPath(FilePath::GetSysDir());
 
 			CStdioFile file;
 			if (file.Open(sFullPath,CFile::modeCreate |CFile::modeWrite ))
@@ -173,7 +172,7 @@ void CJMDBDlg::OnBnClickedButton2()
 
 	if (m_pSectionReg != NULL && bSuccess)
 	{
-		CString sFullPath = FilePath::getSystemTemporaryFolder() + _T("\\JMSJ.sat");
+		CString sFullPath = GetPoolSectionSatPath(FilePath::getSystemTemporaryFolder());
 
 		CString sRegionScrp = _T("");
 		CString sLine;

SourceCode/Code2026/Pool3dCmd/JMSJDlg.cpp

@@ -1,6 +1,7 @@
 #include "stdafx.h"
 #include "JMSJDlg.h"
 #include "CoreTools.h"
+#include "PoolSectionTemp.h"
 #include "JUXCDlg.h"
 #include "GLTKDlg.h"
 #include "BYCDlg.h"
@@ -78,9 +79,7 @@ BOOL CJMSJDlg::OnInitDialog()
 void CJMSJDlg::ShowLastSection()
 {
 	//1.截面
-	CString sFullPath = FilePath::getSystemTemporaryFolder();
-	sFullPath.MakeLower();
-	sFullPath += _T("\\JMSJ.sat");
+	CString sFullPath = GetPoolSectionSatPath(FilePath::getSystemTemporaryFolder());
 
 	AcDbVoidPtrArray arBodyPtrs;
 	if ( Acad::eOk == AcDbBody::acisIn(sFullPath,arBodyPtrs) )
@@ -139,7 +138,7 @@ void CJMSJDlg::OnBnClickedBtaddtodb()
 	UpdateData(TRUE);
 
 	if (!m_curSection.pReg) return;
-	CString sFullPath = FilePath::getSystemTemporaryFolder() + _T("\\JMSJ.sat");
+	CString sFullPath = GetPoolSectionSatPath(FilePath::getSystemTemporaryFolder());
 
 	CString sRegionScrp = _T("");
 	CString sLine;
@@ -425,9 +424,7 @@ void CJMSJDlg::OnBnClickedBtselfromdb()
 		CString sScr,sScrT;
 		if (dlg.GetCrossSectionScr(sScr))
 		{
-			CString sFullPath = FilePath::getSystemTemporaryFolder();
-			sFullPath.MakeLower();
-			sFullPath += _T("\\JMSJ.sat");
+			CString sFullPath = GetPoolSectionSatPath(FilePath::getSystemTemporaryFolder());
 
 			CStdioFile file;
 			if (file.Open(sFullPath,CFile::modeCreate |CFile::modeWrite ))

SourceCode/Code2026/Pool3dCmd/PoolSectionTemp.h

@@ -0,0 +1,11 @@
+#pragma once
+
+// 水池截面 SAT 中转文件路径。
+// 同一个 CAD 进程内所有调用点返回同一路径；不同进程用 PID 区分，
+// 避免两个实例同时写同一个 JMSJ.sat 互相覆盖。
+inline CString GetPoolSectionSatPath(LPCTSTR lpszDir)
+{
+	CString sPath;
+	sPath.Format(_T("%s\\JMSJ_%lu.sat"), lpszDir, (unsigned long)::GetCurrentProcessId());
+	return sPath;
+}