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/OcBaseDownload/WebSocketInterface/data_manager.cpp

@@ -0,0 +1,94 @@
+/**
+  * @RDE_HEADER@
+  * The DataManager class is a convenience class for managing structure data
+  * offers an interface to get and set structure data
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Philipp Dassow, SLST, 2017-03-27
+  */
+#include "WebSocketInterface/data_manager.h"
+
+#include <QVector>
+
+namespace OcBaseDownload
+{
+namespace WebSocketInterface
+{
+
+//---------------------------------------------------------------------------------------------------------
+DataManager::DataManager(MainHandler *mainHandler)
+  : m_mainHandler(mainHandler)
+  , m_currentDownload(CurrentDownload::NOTHING)
+  , m_logger(getLogger(QStringLiteral("DataManager")))
+{
+}
+
+//---------------------------------------------------------------------------------------------------------
+void DataManager::handleErrorMessage(const OcBaseDownload::WebSocketInterface::Messages::ErrorMessage::ErrorData &errData)
+{
+  ERROR_LOG(m_logger) << "uuid: " << errData.uuid << " error class: " << errData.errorClass << " text: " << errData.errorMessage;
+}
+
+//---------------------------------------------------------------------------------------------------------
+void DataManager::servicePortsInformation(const QVector<Messages::ServicePortsInformation::ExerciseInformation> &exerciseInformation)
+{
+  DEBUG_LOG(m_logger) << "Got ServicePortsInformation from websocket";
+  switch (m_currentDownload)
+  {
+  case CurrentDownload::PDF:
+    m_mainHandler->handlerPdfDownload()->handleServicePortsInformation(exerciseInformation);
+    break;
+  case CurrentDownload::BASE:
+    //m_mainHandler->handlerBaseDownload()->handleServicePortsInformation(exerciseInformation);
+    break;
+  case CurrentDownload::NOTHING:
+  default:
+    WARNING_LOG(m_logger) << "Got Ports Information in neither BASE nor PDF download mode";
+    break;
+  }
+}
+
+//---------------------------------------------------------------------------------------------------------
+void DataManager::handlePdfListMessage(const Messages::PdfListMessage::PdfListData &pdfListData)
+{
+  DEBUG_LOG(m_logger) << "Got PDF list from websocket";
+  m_mainHandler->handlerPdfDownload()->handlePdfListData(pdfListData);
+}
+
+//---------------------------------------------------------------------------------------------------------
+void DataManager::setCurrentDownload(CurrentDownload currentDownload)
+{
+  m_currentDownload = currentDownload;
+
+  switch (m_currentDownload)
+  {
+  case CurrentDownload::PDF:
+    DEBUG_LOG(m_logger) << "Setting current download mode to PDF";
+    m_mainHandler->dds()->fts()->enableStartBaseDownload(false);
+    m_mainHandler->dds()->fts()->enableGetPdfList();
+    m_mainHandler->dds()->fts()->enableStartPdfDownload();
+    break;
+  case CurrentDownload::BASE:
+    DEBUG_LOG(m_logger) << "Setting current download mode to BASE";
+    m_mainHandler->dds()->fts()->enableStartBaseDownload();
+    m_mainHandler->dds()->fts()->enableGetPdfList(false);
+    m_mainHandler->dds()->fts()->enableStartPdfDownload(false);
+    break;
+  case CurrentDownload::NOTHING:
+    DEBUG_LOG(m_logger) << "Setting current download mode to NOTHING";
+    m_mainHandler->dds()->fts()->enableAll();
+    break;
+  default:
+    break;
+  }
+}
+
+//---------------------------------------------------------------------------------------------------------
+CurrentDownload DataManager::currentDownload() const
+{
+  return m_currentDownload;
+}
+
+} // namespace WebSocketInterface
+} // namespace OcBaseDownload