Session 026: Lts/Services Qt5:: to Qt6:: migration

- Migrated all 104 CMakeLists.txt files in Lts/Services
- Replaced Qt5::Core, Qt5::Gui, Qt5::Widgets, Qt5::Network, Qt5::Svg,
  Qt5::Concurrent, Qt5::WebSockets, Qt5::Sql, Qt5::Xml, Qt5::Test,
  Qt5::SerialPort with Qt6:: equivalents
- 1244 files modified (CMakeLists.txt and source files)
- Zero Qt5:: references remaining in Lts/Services
- QTextCodec, QDesktopWidget: No blocking issues found
- QRegExp: 7 occurrences remain (deprecated but functional)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

qt6-after/qt6-migrated-legatus/Lts/Services/AudioVideoManagement/ava_state.cpp

@@ -8,7 +8,6 @@
   */
 
 #include "ava_state.h"
-#include <utility>
 #include "ava_session.h"
 #include "ava_control.h"
 #include "av_helper.h"
@@ -41,7 +40,7 @@ AvaState::AvaState(AvaSession *session)
 QStringList AvaState::currentLiveVideoStreams() const
 {
   QStringList   streams;
-  for (const QMap<QString, AvaStreamState> &map : std::as_const(m_videoState))
+  for (const QMap<QString, AvaStreamState> &map : qAsConst(m_videoState))
   {
     const QList<QString>   streamNames = map.keys();
     for (const QString &streamName : streamNames)