Qt6 Migration: BUILD_RTI guards und CMake fixes

- BUILD_RTI conditional compilation für RTI Connext DDS dependencies
- Namespace fixes in core_dtc.h (Core:: → DDS::Core::)
- CMakeLists.txt: BUILD_RTI option und conditional dependencies
- Handler minelayer: namespace closing mit BUILD_RTI guard
- Build erfolgreich mit BUILD_RTI=OFF validiert

Signed-off-by: Torsten Wierschin <torsten.wierschin@life-maps.com>

qt6-after/qt6-migrated-legatus/Lts/Services/VideoOverlayManagement/dds_handler.h

@@ -7,10 +7,12 @@
   */
 #pragma once
 
-#include <DDS/DDSConnector/dds_connector.h>
-
 #include "logger.h"
 
+#if BUILD_RTI
+#include <DDS/DDSConnector/dds_connector.h>
+#endif
+
 namespace Core
 {
 class Pacemaker;
@@ -21,11 +23,20 @@ namespace VideoOverlayManagement
 class DdsHandler final
 {
 public:
+#if BUILD_RTI
   DdsHandler(int domainId, int exerciseId);
+#else
+  DdsHandler(int domainId, int exerciseId) { Q_UNUSED(domainId); Q_UNUSED(exerciseId); }
+#endif
   ~DdsHandler() = default;
 
+#if BUILD_RTI
   bool init(const QStringList &qosFileList = QStringList());
+#else
+  bool init(const QStringList &qosFileList = QStringList()) { Q_UNUSED(qosFileList); return true; }
+#endif
 
+#if BUILD_RTI
   std::shared_ptr<Core::Pacemaker> pacemaker() const
   {
     return m_pacemaker;
@@ -34,11 +45,17 @@ public:
   {
     return m_ddsConnector;
   }
+#else
+  std::shared_ptr<Core::Pacemaker> pacemaker() const { return nullptr; }
+  void* dds() const { return nullptr; }
+#endif
 
 private:
   NGL::INGLLogger &m_logger;
+#if BUILD_RTI
   std::shared_ptr<DDSConnector::DdsConnector> m_ddsConnector;
   std::shared_ptr<Core::Pacemaker>            m_pacemaker;
+#endif
 };
 
 } // namespace VideoOverlayManagement