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/OperatorManagement/main_handler.cpp

@@ -0,0 +1,144 @@
+/**
+  * MainHandler for ExerciseManagement
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  */
+
+#include "main_handler.h"
+
+#include "handler_access_control_level.h"
+#include "handler_operator.h"
+#include "handler_group.h"
+#include "handler_locked_topics.h"
+#include "handler_active_apps.h"
+#include "settings.h"
+
+#include <DDS/DDSConnector/dds_connector.h>
+#include <DDS/Core/pacemaker.h>
+#include <ngldb/db_service_handler.h>
+
+namespace OperatorManagement
+{
+
+MainHandler::MainHandler()
+  : m_logger(getLogger("MainHandler"))
+{}
+
+MainHandler::~MainHandler()
+{
+  // destruction in reverse order:
+  m_handlerActiveApps = nullptr;
+  m_handlerLockedTopics = nullptr;
+  m_handlerWebSocket = nullptr;
+  m_handlerOperator = nullptr;
+  m_handlerGroup = nullptr;
+  m_handlerAcl = nullptr;
+
+  // Finally 'serving' objects:
+  m_ddsHandler = nullptr;
+  m_dbHandler = nullptr;
+}
+
+
+bool MainHandler::init(int domainId)
+{
+  // initialize database
+  m_dbHandler = std::make_shared<DbHandler>();
+
+  if (!m_dbHandler->init(0, Settings::settings()))
+  {
+    ERROR_LOG(m_logger) << "Initialisation dbHandler failed.";
+    return false;
+  }
+
+  // initialize DDS
+  m_ddsHandler = std::make_shared<DdsHandler>(domainId);
+  if (!m_ddsHandler->init())
+    return false;
+
+  // read project specific data from database
+  // publish project specific data
+  // initialize the specific handler
+  if (!initAclHandler())
+    return false;
+
+  {
+    DDSConnector::CoherentSet cs(m_ddsHandler->ddsConnector());
+    if (!initOperatorHandler())
+      return false;
+  }
+
+  if (!initGroupHandler())
+    return false;
+
+  if (!initWebSocketHandler())
+    return false;
+
+  if (!initLockedTopicsHandler())
+    return false;
+
+  if (!initActiveApps())
+    return false;
+
+  m_ddsHandler->pacemaker()->setNewState(Core::RunningState::Running);
+  return true;
+}
+
+bool MainHandler::initAclHandler()
+{
+  m_handlerAcl = std::make_shared<HandlerAccessControlLevel>(this);
+
+  return m_handlerAcl->init();
+}
+
+bool MainHandler::initOperatorHandler()
+{
+  m_handlerOperator = std::make_shared<HandlerOperator>(this);
+
+  return m_handlerOperator->init();
+}
+
+bool MainHandler::initGroupHandler()
+{
+  m_handlerGroup = std::make_shared<HandlerGroup>(this);
+
+  return m_handlerGroup->init();
+}
+
+bool MainHandler::initLockedTopicsHandler()
+{
+  m_handlerLockedTopics = std::make_shared<HandlerLockedTopics>(*this);
+
+  return m_handlerLockedTopics->init();
+}
+
+bool MainHandler::initWebSocketHandler()
+{
+  // WebSocketServer
+  m_handlerWebSocket =  std::make_shared<WebSocketInterface::WebSocketInterfaceHandler>(this);
+  DEBUG_LOG(m_logger) << "Reset WebSocketInterfaceHandler succesful.";
+  if (!m_handlerWebSocket->init())
+  {
+    ERROR_LOG(m_logger) << "Initialisation WebSocketInterfaceHandler failed.";
+    return false;
+  }
+  m_ddsHandler->pacemaker()->addPort(m_handlerWebSocket->serverWebSocketPort(), Core::PortType::WebSocketServer);
+  DEBUG_LOG(m_logger) << "Initialisation WebSocketInterfaceHandler succesful.";
+
+  return true;
+}
+
+bool MainHandler::initActiveApps()
+{
+  m_handlerActiveApps = std::make_shared<HandlerActiveApps>(this);
+
+  return m_handlerActiveApps->init();
+}
+
+std::shared_ptr<DatabaseInterface> MainHandler::db() const
+{
+  return m_dbHandler->db();
+}
+
+} // namespace OperatorManagement