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/Tools/DBAdministration/showLogFile.cpp

@@ -0,0 +1,58 @@
+/*
+ * @RDE_HEADER@
+ * <short description>
+ * $Id$
+ * $HeadURL$
+ * $Author$
+ * Created by Malte Schröder, SLSE, 2016-06-08
+ */
+
+#include "showLogFile.h"
+#include "ui_showLogFile.h"
+#include <nglsettings/nglsettings_settings.h>
+
+namespace DBAdministration
+{
+ShowLogFile::ShowLogFile(QWidget *parent)
+  : QWidget(parent)
+  , m_ui(new Ui::ShowLogFile)
+  , m_logger(getLogger("ShowLogFile"))
+{
+  m_ui->setupUi(this);
+
+  connect(m_ui->pbClose, &QPushButton::clicked, this, &ShowLogFile::onClosedClicked);
+
+}
+
+ShowLogFile::~ShowLogFile()
+{
+  delete m_ui;
+}
+
+bool ShowLogFile::init()
+{
+   QString logFile = NGL::Settings::logPath() + QStringLiteral("/") + QString::fromLatin1(qgetenv("USER")) + QStringLiteral("_scm.log");
+
+   ERROR_LOG(m_logger) << "Logfile: " << logFile;
+
+   QFile file(logFile);
+
+   if (!file.open(QIODevice::ReadOnly))
+   {
+     ERROR_LOG(m_logger) << "Cannot open file " << logFile;
+     return false;
+   }
+
+   QByteArray output = file.readAll();
+
+   m_ui->plainTextEdit->setPlainText(QString::fromLocal8Bit(output));
+
+   return true;
+}
+
+void ShowLogFile::onClosedClicked()
+{
+  close();
+}
+
+} // namespace DBAdministration