Qt6 Migration: Complete migration with DDS/RTI support and build validation

Major Changes:
- Merged latest Qt5 devel content from dlbo (292 files changed, 7 new dirs)
- Consolidated forward-declarations and include folders
- Removed unneeded modules per Niklas' repo check list

Build System Fixes:
- Fixed CMake VERSION_GREATER syntax in ParticipantManagement/CMakeLists.txt
- Added VLC packages (libvlc-dev, vlc-plugin-base) to docker_build.sh
- Added PostgreSQL dev packages (libpq-dev, postgresql-server-dev-all) to Dockerfile
- Fixed locale warnings (ANSI_X3.4-1968 → C.UTF-8)
- Fixed ArcGIS SDK path warnings when BUILD_ARCGIS=OFF

Code Generation Fixes:
- Fixed IDL enum collisions (PortType→CorePortType/DdsutPortType, PdmEventType)
- Fixed Grantlee template svc_translation.cpp.grantlee:
  - Changed {{ idl_enum.name }}_def:: to {{ idl_enum.name }}::
  - Fixed .underlying() calls for C++11 scoped enums (enum class)
- Removed generated files from repo (moc_*, *_dtc.h, *_ftc.h)

Validation:
- BUILD_RTI=ON: SUCCESS
- BUILD_RTI=OFF: SUCCESS
- C++17 standard maintained for RTI 7.7 compatibility
- Ubuntu 26.04 Docker environment verified

Remaining Warnings (expected):
- BgViewer, KDChart, KDReports, Poppler-Qt6 not found (optional features)

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

qt5-before/dlbo/Lts/Services/RoutingServiceNG/session_handler.h

@@ -0,0 +1,64 @@
+/**
+  * @RDE_HEADER@
+  * Routing Test - main object
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  */
+
+#pragma once
+
+#include <QObject>
+#include <QMap>
+
+#include <RoutingServiceNG/rsccommon_export.h>
+#include "logger.h"
+#include "session.h"
+#include <DDS/DDSConnector/dds_connector.h>
+
+namespace LtsPluginManager
+{
+struct PluginInstance;
+}
+namespace DDSGeneric
+{
+class TopicTypePlugin;
+}
+
+namespace RoutingService
+{
+class TopicDispatcherInterface;
+
+class RSCCOMMON_EXPORT SessionHandler : public QObject
+{
+public:
+  SessionHandler(IDL::PartitionType partitionType,
+                 const std::shared_ptr<DDSConnector::DdsConnector> &ddsConnectorSv,
+                 const std::shared_ptr<DDSConnector::DdsConnector> &ddsConnectorWs);
+  ~SessionHandler();
+
+  bool init();
+  void shutdown();
+
+public Q_SLOTS:
+  void onCreateSession(const QString &partitionNameSv, const QString &partitionNameWs);
+  void onDestroySession(const QString &partitionNameSv, const QString &partitionNameWs);
+private:
+  bool loadPlugins();
+  bool loadPlugin(const LtsPluginManager::PluginInstance &pi);
+
+  std::vector<TopicDispatcherInterface *> topicsToRouteToWs() const;
+  std::vector<TopicDispatcherInterface *> topicsToRouteToSv() const;
+
+private:
+  std::vector<DDSGeneric::TopicTypePlugin *> m_topicTypePlugins;
+
+  IDL::PartitionType m_partitionType;
+  std::shared_ptr<DDSConnector::DdsConnector> m_ddsConnectorSv;
+  std::shared_ptr<DDSConnector::DdsConnector> m_ddsConnectorWs;
+
+  QMap<QString, Session *> m_sessionMap;
+
+  NGL::INGLLogger &m_logger;
+};
+} // namespace RoutingService