Qt6 migration: Fix BUILD_RTI=OFF build errors in TrainingAreaBase

- training_area_telegrams.cpp: Fixed QJsonObject initializer syntax (Qt6 requires {{}} not ({}))
- training_area_telegrams.cpp: Fixed fromJson() methods to access m_* members directly
- training_area_telegrams.cpp: Fixed brace mismatches in multiple toJson() methods
- training_area_telegrams.h: Changed Header struct to public members for consistency
- tx_mixin.cpp: Fixed getEquipmentNumber() template for direct member access
- lts_coordinate.cpp: Added missing #include <iomanip>
- MIGRATION_STATUS.md: Added migration progress tracking document

C++17 constraint enforced due to RTI Connext DDS 7.7.0 incompatibility with C++20+

Build status: BUILD_RTI=OFF successful (0 errors, warnings only)

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

qt6-after/qt6-migrated-legatus/Lts/Common/LtsAppManager/AppChooser/CustomViews/app.h

@@ -1,7 +1,7 @@
 
 
 #pragma once
-#include <QObject>
+#include <QtCore/QObject>
 #include <Viewer/LtsDataView/abstract_display_widget.h>
 
 namespace Ui

qt6-after/qt6-migrated-legatus/Lts/Common/LtsAppManager/AppChooser/app_chooser.cpp

@@ -7,8 +7,8 @@
 #include "lts_app_manager.h"
 #include "ui_app_chooser.h"
 
-#include <QCloseEvent>
-#include <QDebug>
+#include <QtGui/QCloseEvent>
+#include <QtCore/QDebug>
 
 namespace LtsAppManager
 {

qt6-after/qt6-migrated-legatus/Lts/Common/LtsAppManager/AppChooser/app_chooser.h

@@ -1,8 +1,8 @@
 
 #pragma once
 #include <LtsAppDescriptor/lts_app_descriptor.h>
-#include <QObject>
-#include <QWidget>
+#include <QtCore/QObject>
+#include <QtWidgets/QWidget>
 
 namespace Ui
 {

qt6-after/qt6-migrated-legatus/Lts/Common/LtsAppManager/AppChooser/app_chooser_model.h

@@ -2,7 +2,7 @@
 #pragma once
 #include <LtsAppDescriptor/lts_app_descriptor.h>
 #include <LtsWidgets/lts_abstract_table_model.h>
-#include <QObject>
+#include <QtCore/QObject>
 
 namespace LtsAppManager
 {

qt6-after/qt6-migrated-legatus/Lts/Common/LtsAppManager/lts_app_manager.cpp

@@ -13,16 +13,16 @@
 #include <LtsWidgets/lts_global_wait_dialog.h>
 #include <OperatorManagement/opm_settings_gui_plugin_interface.h>
 #include <PluginInterfaces/gui_plugin_interface.h>
-#include <QCoreApplication>
-#include <QJsonArray>
-#include <QJsonDocument>
-#include <QJsonObject>
-#include <QJsonValue>
-#include <QMessageBox>
-#include <QTcpServer>
-#include <QTcpSocket>
-#include <QTimer>
-#include <QUuid>
+#include <QtCore/QCoreApplication>
+#include <QtCore/QJsonArray>
+#include <QtCore/QJsonDocument>
+#include <QtCore/QJsonObject>
+#include <QtCore/QJsonValue>
+#include <QtWidgets/QMessageBox>
+#include <QtNetwork/QTcpServer>
+#include <QtNetwork/QTcpSocket>
+#include <QtCore/QTimer>
+#include <QtCore/QUuid>
 #include <utility>
 
 #ifndef LTS_VERSION_MAJOR

qt6-after/qt6-migrated-legatus/Lts/Common/LtsAppManager/lts_app_manager.h

@@ -5,8 +5,8 @@
 #include <LtsSession/lts_session.h>
 #include <LtsWidgets/lts_base_layout_widget.h>
 #include <LtsWidgets/lts_dialog.h>
-#include <QObject>
-#include <QVector>
+#include <QtCore/QObject>
+#include <QtCore/QVector>
 #include <memory>
 
 #ifndef LTSAPPMANAGER_EXPORT