LtsSession-STUB und GuezNasat-Fixes für BUILD_RTI=OFF

- CMakeLists.txt: Conditional compilation für BUILD_RTI=ON/OFF
- lts_session_stub.h/cpp: NEU - STUB-Implementation ohne RTI-Abhängigkeit
- lts_session_data_dds_stub.h: Doppeltes Namespace-Closing entfernt
- gna_nasat_aircraft.h: participantId zu participantIdValue umbenannt (Konflikt)
- gna_dtc.h: Doppeldefinitionen entfernt
- gna_nasat_aircraft_participant.h: Doppeldefinitionen entfernt
- ppm_enums.hpp: DataModification-Enum im ParticipantManagement-Namespace
- ElevationMap-STUB: ArcGIS-Abhängigkeit für BUILD_RTI=OFF gekapselt
- Viewer-STUB: Header für BUILD_RTI=OFF Build

Build-Validierung: Configure erfolgreich, LtsSession-Fehler behoben

qt6-after/qt6-migrated-legatus/Lts/Common/LtsSession/lts_session_stub.cpp

@@ -0,0 +1,60 @@
+/**
+ * @RDE_HEADER@
+ * Stub implementation for lts_session.cpp when BUILD_RTI=OFF
+ * Provides minimal LtsSession class without RTI Connext DDS dependencies
+ */
+
+#include "lts_session_stub.h"
+#include <QDebug>
+
+namespace LtsSession
+{
+
+LtsSession::LtsSession(QObject* parent)
+    : LtsSessionDataDds(parent)
+    , m_initialized(false)
+    , m_sessionId(QStringLiteral("stub-session"))
+{
+}
+
+LtsSession::~LtsSession() = default;
+
+bool LtsSession::init(const DdsConnectionParams& /*params*/)
+{
+    qWarning() << "LtsSession::init() called in STUB mode (BUILD_RTI=OFF) - no DDS functionality available";
+    m_initialized = false;
+    emit initialized(false);
+    return false;
+}
+
+bool LtsSession::isInitialized() const
+{
+    return m_initialized;
+}
+
+std::shared_ptr<DataPluginBase::Interface> LtsSession::dataPlugin() const
+{
+    return nullptr;
+}
+
+std::shared_ptr<GuiPluginBase::Interface> LtsSession::guiPlugin() const
+{
+    return nullptr;
+}
+
+QString LtsSession::sessionId() const
+{
+    return m_sessionId;
+}
+
+int LtsSession::exerciseId() const
+{
+    return -1;
+}
+
+QString LtsSession::toString() const
+{
+    return QStringLiteral("LtsSession(stub, initialized=%1)").arg(m_initialized ? "true" : "false");
+}
+
+} // namespace LtsSession