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/Proxies/GuezNasat/abstract_socket_handler.cpp

@@ -0,0 +1,83 @@
+/**
+  * Websocket interface for building control unit
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Christian Ehrlicher, SLSE, 2017-01-30
+  */
+
+#include "abstract_socket_handler.h"
+#include "guez_nasat_telegrams.h"
+#include "settings.h"
+#include <QDateTime>
+#include <QJsonDocument>
+
+namespace GuezNasat
+{
+AbstractSocketHandler::AbstractSocketHandler(const char *loggerName, QObject *parent)
+  : QObject(parent)
+  , m_logger(getLogger(loggerName))
+{}
+
+void AbstractSocketHandler::setSimulationStatus(int nasatId, bool bActivateSimulation)
+{
+  NasatSimulationRequest req;
+  req.aircraftId = nasatId;
+  req.timestamp = QDateTime::currentSecsSinceEpoch();
+  req.enableSimulation = bActivateSimulation;
+  const QPointF pos = Settings::simulationPositionDegree();
+  req.position.lon = pos.x();
+  req.position.lat = pos.y();
+  sendTelegram(&req);
+}
+
+bool AbstractSocketHandler::sendTelegram(const NasatBase *tele)
+{
+  if (!isConnected() || !tele)
+    return false;
+
+  QJsonObject obj;
+  obj[QStringLiteral("data")] = tele->toJson();
+  obj[QStringLiteral("type")] = tele->type();
+  return sendTelegramInternal(QJsonDocument(obj).toJson(QJsonDocument::Compact));
+}
+
+void AbstractSocketHandler::textMessageReceived(const QByteArray &msg)
+{
+  if (msg.isEmpty())
+  {
+    ERROR_LOG(m_logger) << "Empty message received";
+    return;
+  }
+  const QJsonObject obj = QJsonDocument::fromJson(msg).object();
+  DEBUG_LOG(m_logger) << "incoming telegram: " << msg;
+
+  const QJsonValue type = obj.value(QStringLiteral("type"));
+  if (!type.isString())
+  {
+    ERROR_LOG(m_logger) << "Can not read type id: " << msg;
+    return;
+  }
+  const QString typeStr = type.toString();
+  const QJsonObject data = obj.value(QStringLiteral("data")).toObject();
+  try
+  {
+    if (typeStr.compare(Constraints<NasatPosition>::type(), Qt::CaseInsensitive) == 0)
+      emit positionReceived(NasatPosition::fromJson(data));
+    else if (typeStr.compare(Constraints<NasatWeaponRelease>::type(), Qt::CaseInsensitive) == 0)
+      emit weaponReleaseReceived(NasatWeaponRelease::fromJson(data));
+    else if (typeStr.compare(Constraints<NasatNineLiner>::type(), Qt::CaseInsensitive) == 0)
+      emit nineLinerReceived(NasatNineLiner::fromJson(data));
+    else if (typeStr.compare(Constraints<NasatSimulationStatus>::type(), Qt::CaseInsensitive) == 0)
+      emit simulationStatusReceived(NasatSimulationStatus::fromJson(data));
+    else
+      ERROR_LOG(m_logger) << "Got unknown json telegram: " << msg;
+  }
+  catch (const JsonException &ex)
+  {
+    ERROR_LOG(m_logger) << "Could not parse json telegram: " << msg
+                        << ", error: " << ex.what();
+  }
+}
+
+} // namespace GuezNasat