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/AudioVideoManagement/stream_name_mapping.h

@@ -0,0 +1,93 @@
+/**
+  * @RDE_HEADER@
+  * StreamNameMapping
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Christian Fröbel, NLSE, 2018-03-12
+  */
+
+#pragma once
+
+#include "avm_export.h"
+#include <QObject>
+#include <QString>
+#include <QRegExp>
+#include <cstdint>
+#include <map>
+#include <vector>
+
+
+enum class DataModification;
+
+
+namespace AudioVideoManagement
+{
+
+namespace Interface
+{
+class Dtc;
+}
+
+class StreamName;
+
+/**
+ * In AVS, the names of audio and video streams need to be unique within a given exercise.
+ * As the stream name used internally by AVS is not necessarily what the user wants
+ * to see in the GUI, we define a mapping from internalName to displayName.
+ *
+ * The internalName is assigned by the AVM Service. Here, the stream name will probably
+ * contain the MountingPoint-Id.
+ * The displayName is determined by properties of the MountingPoint.
+ *
+ * For each MountingPoint the AVS service will publish the corresponding internal-
+ * and displayName and thus serves as the source of this mapping.
+ *
+ * @author Christian Fröbel
+ */
+class AVM_COMMON_EXPORT StreamNameMapping : public QObject
+{
+  Q_OBJECT
+
+public:
+  struct Names
+  {
+    QString   internal;
+    QString   display;
+  };
+
+  /**
+   * Don't use directly, use create() instead.
+   * Only provided for UnitTests.
+   */
+  StreamNameMapping() = default;
+
+  static StreamNameMapping *create(Interface::Dtc *dtc);
+
+  QString   internalName(int32_t mountingPointId) const;
+  QString   internalName(const QString &displayName);
+
+  QString   displayName(int32_t mountingPointId) const;
+
+  /** The internalName might contain a source specifier "(S)" or "(L)" at the end. */
+  QString   displayName(const QString &internalName) const;
+
+  std::vector<Names> allNames() const;
+
+signals:
+  void changed(int32_t mountingPointId, const QString &internalName, const QString &displayName);
+
+private slots:
+  void onStreamNameChanged(const StreamName &streamName, DataModification modType);
+
+private:
+  void define(int32_t mountingPointId, const Names &names);
+  void remove(int32_t mountingPointId);
+
+  /** Used to extract the effective streamName if it contains a source specifier "(S)" or "(L)". */
+  const QRegExp                m_extractor{QStringLiteral("(.*)(\\([SL]\\))"), Qt::CaseInsensitive};
+  std::map<int32_t, Names>     m_mpToNames;         //!< MountingPoint-Id -> internal AVS name
+  std::map<QString, QString>   m_internalToDisplay;
+};
+
+} // namespace AudioVideoManagement