LtsSession/LtsElevation: BUILD_RTI Guards komplett, EXTERNAL_DEPENDENCIES.md

- lts_session_data_dds.h/cpp: Vollständig mit #ifdef BUILD_RTI geschützt
  Vermeidet vtable/qt_metacast Linker-Fehler bei BUILD_RTI=OFF
- lts_session.cpp: LtsSessionDataDds-Aufrufe mit BUILD_RTI Guards
  toString(): N/A-Placeholder im else-Zweig
  event(): QObject::event(e) statt LtsSessionDataDds::event(e)
- lts_elevation_manager.cpp:
  - m_logger im Initializer-List initialisieren (Reference-Member)
  - initDDS: Kein Zugriff auf incomplete type bei BUILD_RTI=OFF
  - createInstance: Rückgabetyp korrigiert (nullptr statt QStringList)
  - getFilenamesForExercise/TrainingArea: #ifdef BUILD_RTI
  - exerciseIdToTrainingAreaId: static method mit BUILD_RTI guard
- elevation_map_manager.h: QPoint3D-STUB entfernt, Forward-Declaration
- cnr_frequency_planning_helper.h/cpp: Vollständig mit BUILD_RTI geschützt
- EXTERNAL_DEPENDENCIES.md: Dokumentation fehlender external deps
  - RTI GCC-Inkompatibilität (DDS_OctetSeq vs DDS_OctetsSeq)
  - BUILD_RTI temporär OFF, BUILD_ARCGIS=ON default

Build-Status: LtsSession [17/1589] erfolgreich, LtsElevation gebaut
Offene Build-Fehler durch fehlende externe Dependencies (erwartet)

qt6-after/qt6-migrated-legatus/Lts/Proxies/CombatNetRadio/Helper/cnr_frequency_planning_helper.cpp

@@ -1,4 +1,7 @@
 #include "cnr_frequency_planning_helper.h"
+
+#ifdef BUILD_RTI
+
 #include <utility>
 #include <AudioVideoManagement/avm_translation.h>
 #include <QJsonObject>
@@ -271,4 +274,6 @@ bool isAkwMode(RcOperatingMode mode)
   return mode == RcOperatingMode::AkwEncEccm || mode == RcOperatingMode::AkwEncNone;
 }
 
-} 
+} // namespace AudioVideoManagement
+
+#endif // BUILD_RTI 

qt6-after/qt6-migrated-legatus/Lts/Proxies/CombatNetRadio/Helper/cnr_frequency_planning_helper.h

@@ -1,4 +1,5 @@
 #pragma once
+
 #include <QString>
 #include <QJsonDocument>
 #include <QJsonObject>
@@ -117,4 +118,6 @@ struct SVCCNRHELPER_EXPORT RadioCircuitVHF: public RadioCircuit
   QJsonObject            SVCCNRHELPER_EXPORT frequencyPlanningJson(QJsonObject obj, const QString &name, FrequencyBand freqBand, int radioStationId);
   bool                   SVCCNRHELPER_EXPORT isAkwMode(RcOperatingMode mode);
 
-} 
+}
+
+#endif // BUILD_RTI