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>

qt6-after/qt6-migrated-legatus/Lts/Plugins/ServiceManagement/Data/scm_data_plugin.cpp

@@ -0,0 +1,33 @@
+/**
+  * @RDE_HEADER@
+  * Data Plugin for ServiceManangement
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Mike Wille, SLSE, 2016-03-30
+  */
+
+#include "scm_data_plugin.h"
+
+#include <DDS/DDSConnector/dds_connector.h>
+#include <LtsSession/lts_session_data_dds.h>
+
+namespace ServiceManagement
+{
+std::shared_ptr<DataPluginBase::Interface> DataPlugin::createDataInterface(LtsSession::LtsSessionDataDds *session)
+{
+  std::shared_ptr<ServiceManagement::Interface::Dtc> dtc;
+  std::shared_ptr<ServiceManagement::Interface::Ftc> ftc;
+  if (!session->createTopicClient(dtc, ftc, false ,true))
+    return std::shared_ptr<DataPluginBase::Interface>();
+  return std::make_shared<DataInterfaceImpl>(dtc, ftc);
+}
+
+DataInterfaceImpl::DataInterfaceImpl(const std::shared_ptr<ServiceManagement::Interface::Dtc> &dtc,
+                                     const std::shared_ptr<ServiceManagement::Interface::Ftc> &ftc)
+  : DataInterface()
+  , m_dtc(dtc)
+  , m_ftc(ftc)
+{}
+
+} // namespace ServiceManagement