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/Plugins/AudioVideoManagement/Gui/MobileVideoSystem/receiverelement.cpp

@@ -0,0 +1,86 @@
+#include "receiverelement.h"
+#include "ui_receiverelement.h"
+
+#include <QPainter>
+#include <QStyleOption>
+#include <QStyle>
+
+ReceiverElement::ReceiverElement(QWidget *parent)
+  : QWidget(parent)
+  , m_ui(new Ui::ReceiverElement)
+{
+  m_ui->setupUi(this);
+  connect(m_ui->receiverWidget, &ReceiverItem::clicked,
+          this, &ReceiverElement::clicked);
+
+  setProperty("isChecked", false);
+}
+
+ReceiverElement::~ReceiverElement()
+{
+  delete m_ui;
+}
+
+void ReceiverElement::paintEvent(QPaintEvent *)
+{
+  QStyleOption opt;
+  opt.initFrom(this);
+  QPainter p(this);
+  style()->drawPrimitive(QStyle::PE_Widget, &opt, &p, this);
+}
+
+QRadioButton *ReceiverElement::radioButton()
+{
+  return m_ui->radioButton;
+}
+
+bool ReceiverElement::init(const AudioVideoManagement::VideoReceiver &rec)
+{
+  setProperty("teamId", rec.teamId());
+  setProperty("recId", rec.id());
+
+  setSnr(rec.snr());
+  setDbm(rec.dbm());
+  setButtonChecked(rec.isActive());
+
+  return true;
+}
+
+void ReceiverElement::setButtonChecked(bool checked)
+{
+  setProperty("isChecked", checked);
+
+  style()->unpolish(this);
+  style()->polish(this);
+  QEvent event(QEvent::StyleChange);
+  QApplication::sendEvent(this, &event);
+  update();
+  updateGeometry();
+}
+
+void ReceiverElement::setSnr(int snr)
+{
+  m_ui->receiverWidget->setSnr(snr);
+}
+
+void ReceiverElement::setDbm(int dbm)
+{
+  m_ui->receiverWidget->setDbm(dbm);
+}
+
+void ReceiverElement::setStreamName(const QString &streamName)
+{
+  m_streamName = streamName;
+  m_ui->receiverWidget->setStreamName(streamName);
+}
+
+void ReceiverElement::setFrequency(int frequency)
+{
+  m_ui->receiverWidget->setFrequency(frequency);
+}
+
+void ReceiverElement::setIsLocked(bool isLocked)
+{
+  m_ui->receiverWidget->setIsLocked(isLocked);
+}
+