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/Plugins/TakeHomePackageManager/THP2/Thp2Management/tpm2_exported_scripts_dialog.cpp

@@ -20,22 +20,22 @@
 #include <LtsSession/lts_session.h>
 #include <LtsSession/lts_session_data.h>
 
-#include <QDir>
-#include <QFile>
-#include <QJsonArray>
-#include <QJsonDocument>
-#include <QJsonObject>
-#include <QProcess>
-#include <QTemporaryFile>
-#include <QNetworkAccessManager>
-#include <QNetworkRequest>
-#include <QNetworkReply>
-#include <QUrl>
+#include <QtCore/QDir>
+#include <QtCore/QFile>
+#include <QtCore/QJsonArray>
+#include <QtCore/QJsonDocument>
+#include <QtCore/QJsonObject>
+#include <QtCore/QProcess>
+#include <QtCore/QTemporaryFile>
+#include <QtNetwork/QNetworkAccessManager>
+#include <QtNetwork/QNetworkRequest>
+#include <QtNetwork/QNetworkReply>
+#include <QtCore/QUrl>
 #include <QtWebSockets/QWebSocket>
 #include <QLocale>
-#include <QTimer>
+#include <QtCore/QTimer>
 #include <QTemporaryDir>
-#include <QDesktopServices>
+#include <QtGui/QDesktopServices>
 
 #include <memory>
 

qt6-after/qt6-migrated-legatus/Lts/Plugins/TakeHomePackageManager/THP2/Thp2Management/tpm2_exported_scripts_dialog.h

@@ -8,7 +8,7 @@
 #include <Common2/tpm_exported_scripts_model.h>
 #include <LtsWidgets/lts_dialog.h>
 
-#include <QUrlQuery>
+#include <QtCore/QUrlQuery>
 
 
 namespace Ui