fix: 修复 GiDrawUtility::DrawPipe 每次画管泄漏 region

- 删除重复调用且丢弃结果的 createRegion（L1：每次调用必漏一个 AcDbRegion）
- 内圆 region 创建失败时释放 pBig（L2a）
- booleanOper 成功后释放第二个操作数 pSml（L2b，与 AecDbEwPipeBase/AecDbEwFitting 惯例一致）

SourceCode/Code2026/AecRxBase/GiDrawUtility.cpp

@@ -674,7 +674,6 @@ AcDbEntity* GiDrawUtility::DrawPipe(const AcGePoint3d& ptFrom
 {
 	AcDbCircle Cir1(AcGePoint3d::kOrigin, AcGeVector3d::kZAxis, dRadius);
 
-	if (!createRegion(&Cir1)) return NULL;
 	AcDbRegion *pBig = createRegion(&Cir1);
 	if (!pBig) return NULL;
 
@@ -683,7 +682,11 @@ AcDbEntity* GiDrawUtility::DrawPipe(const AcGePoint3d& ptFrom
 	{
 		AcDbCircle Cir2(AcGePoint3d::kOrigin, AcGeVector3d::kZAxis, dRadius - dThick);
 		pSml = createRegion(&Cir2);
-		if (!pSml) return NULL;
+		if (!pSml)
+		{
+			DELETE_PTR(pBig);
+			return NULL;
+		}
 	}
 
 	// 这里做一个布尔减
@@ -696,6 +699,7 @@ AcDbEntity* GiDrawUtility::DrawPipe(const AcGePoint3d& ptFrom
 			DELETE_PTR(pSml);
 			return NULL;
 		}
+		DELETE_PTR(pSml);
 	}
 
 	AcDbRegion *pRegion(pBig);