Fix INGLLogger initialization for BUILD_RTI=OFF compatibility

- Replace NGL::NGLLoggerBootstrap::getNGLRootLogger() with NGL::getMemoryLogger()
  in all VideoOverlayManagement handler classes
- Fix Qt6 signal syntax in avs_interface.cpp (error → errorOccurred)
- Ensures compatibility with BUILD_RTI=OFF builds
- Affected files:
  * logger.cpp - Added BUILD_RTI guards, use NGL::getMemoryLogger()
  * avs_interface.cpp - Logger init + Qt6 signal fix
  * main_handler.cpp - Logger init fix
  * handler_overlays.cpp - Logger init fix
  * handler_infrastructure_data.cpp - Logger init fix
  * handler_participant_data.cpp - Logger init fix

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

qt6-after/qt6-migrated-legatus/Lts/Services/VideoOverlayManagement/main_handler.cpp

@@ -30,7 +30,7 @@ MainHandler::MainHandler(QObject *parent) : QObject(parent)
   , m_checkConnectTimer(new QTimer(this))
   , m_keepAliveTriggerTimer(new QTimer(this))
   , m_bAvsSocketWarnedOnce(false),
-    m_logger(NGL::NGLLoggerBootstrap::getNGLRootLogger()) {
+    m_logger(NGL::getMemoryLogger()) {
 } // end of ctor()
 //-----------------------------------------------------------------------------