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/SituationReplay/main_handler.cpp

@@ -0,0 +1,74 @@
+/**
+  * MainHandler for SituationReplay
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Hanna E. Rathje, SLSE, 2016-01-13
+  */
+
+#include "main_handler.h"
+#include "settings.h"
+#include "db_reader.h"
+
+#include "handler_situation_replay.h"
+#include <DDS/DDSConnector/dds_connector.h>
+#include <ngldb/db_service_handler.h>
+
+namespace SituationReplay
+{
+
+MainHandler::MainHandler()
+  : m_handlerSrp(nullptr)
+  , m_ddsInterface(nullptr)
+  , m_dbHandler(nullptr)
+  , m_logger(getLogger("MainHandler"))
+{}
+
+MainHandler::~MainHandler()
+{
+  m_dbReader = nullptr;
+  m_handlerSrp = nullptr;
+  m_ddsInterface = nullptr;
+  m_dbHandler = nullptr;
+}
+
+bool MainHandler::init(const SituationReplay::ConnectionParams &input,
+                       const SituationReplay::ConnectionParams &output)
+{
+  // initialize database
+  m_dbHandler = std::make_shared<DbHandler>();
+  if (!m_dbHandler->init(input.partitionId, Settings::settings()))
+  {
+    ERROR_LOG(m_logger) << "Initialisation dbHandler failed.";
+    return false;
+  }
+
+  // initialize DDS
+  m_ddsInterface = std::make_shared<DdsHandler>(input, output);
+  if (!m_ddsInterface->init())
+    return false;
+
+  m_dbReader = std::make_shared<DbReader>(m_ddsInterface->ddsReplay(), input.partitionId, true);
+  if (!m_dbReader->init(m_dbHandler->db()->database()))
+    return false;
+
+  // read project specific data from database
+  // publish project specific data
+  // initialize the specific handler
+  if (!initSrpHandler(input.partitionId, output.partitionId))
+    return false;
+
+  return true;
+}
+
+bool MainHandler::initSrpHandler(int partitionIdIn, int partitionIdOut)
+{
+  m_handlerSrp.reset(new HandlerSituationReplay(m_ddsInterface, m_dbHandler->db(), m_dbReader));
+
+  if (!m_handlerSrp->init(partitionIdIn, partitionIdOut))
+    return false;
+
+  return true;
+}
+
+} // namespace SituationReplay