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/exercise.h

@@ -0,0 +1,78 @@
+/**
+  * @RDE_HEADER@
+  * Exercise
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Christian Fröbel, SLSE, 2017-11-30
+  */
+
+#pragma once
+
+#include "exercise_context.h"
+#include "avm_export.h"
+#include "asset.h"
+#include "mounting_point.h"
+#include <QObject>
+#include <boost/optional.hpp>
+#include <memory>
+#include <map>
+#include <vector>
+
+namespace AudioVideoManagement
+{
+
+class Asset;
+class MountingPoint;
+
+/**
+ * @author Christian Fröbel
+ */
+class AVM_COMMON_EXPORT Exercise : public QObject
+{
+  Q_OBJECT
+
+public:
+  explicit Exercise(const ExerciseContext &context)
+    : m_context(context)
+  {}
+
+  const ExerciseContext &context() const { return m_context; }
+
+  /**
+   * Move the *mounted* Asset and MountingPoint from this Exercise
+   * to the targetExercise.
+   * Emits assetUnassigned() for this Exercise and assetAssigned() for targetExercise.
+   * If modifiedData is set, the asset will be updated with that data.
+   * The update will be applied between both signals.
+   */
+  void moveMountedTo(Asset *asset, Exercise *targetExercise, const boost::optional<InfrastructureManagement::InstrumentationAsset> &modifiedData);
+
+  void add(std::unique_ptr<Asset> &&asset);
+  void add(std::unique_ptr<MountingPoint> &&mountingPoint);
+
+  std::unique_ptr<Asset>         take(Asset *asset);
+  std::unique_ptr<MountingPoint> take(MountingPoint *mountingPoint);
+
+  /** @return nullptr if not found */
+  Asset *findAsset(int id);
+
+  std::vector<Asset *> assets() const;
+
+  /** @return nullptr if not found */
+  MountingPoint *findMountingPoint(int id);
+
+  bool isEmpty() const { return m_assets.empty() && m_mountingPoints.empty(); }
+
+signals:
+  void assetAssigned(Asset *asset);
+  void assetUnassigned(Asset *asset);
+
+private:
+  ExerciseContext                                 m_context;
+  std::map<int, std::unique_ptr<Asset>>           m_assets;
+  std::map<int, std::unique_ptr<MountingPoint>>   m_mountingPoints;
+};
+
+} // namespace AudioVideoManagement
+