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/main_handler.h

@@ -0,0 +1,85 @@
+/**
+  * MainHandler for AereaEffectSimulation
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  */
+#pragma once
+
+#include <QObject>
+#include "logger.h"
+#include "avm_db.h"
+#include <memory>
+
+namespace NGLDB
+{
+template <typename DB> class DbServiceHandler;
+}
+
+namespace AudioVideoManagement
+{
+using DbHandler = NGLDB::DbServiceHandler<DatabaseInterface>;
+class DdsHandler;
+class AVControl;
+class FMControl;
+class ExercisesHandler;
+class HandlerMenuStruct;
+class TvcHandler;
+class CnrHandler;
+class FrequencySetHandler;
+class FrequencyPlanningHandler;
+class CnrTvcProfileHandler;
+class ActiveExercises;
+class StreamNameMappingPublisher;
+class HandlerVideoReceiver;
+class HandlerVideoTeam;
+class HandlerFrequencyPlanningStatus;
+
+namespace Interface
+{
+class Dts;
+class Fts;
+}
+
+class MainHandler : public QObject
+{
+  Q_OBJECT
+public:
+  explicit MainHandler(QObject *parent = nullptr);
+  ~MainHandler();
+
+  bool init(int domainId);
+  int exerciseId();
+
+  DdsHandler *ddsHandler() { return m_ddsHandler.get(); }
+  DatabaseInterface *db() { return m_dbInterface.get(); }
+  AVControl *avControl() { return m_avControl.get(); }
+  FMControl *fmControl() { return m_fmControl.get(); }
+  ExercisesHandler *exHandler() { return m_exHandler.get(); }
+  HandlerVideoTeam *videoTeamHandler() { return m_videoTeamHandler.get(); }
+  HandlerFrequencyPlanningStatus *frequencyPlanningStatusHandler() { return m_frequencyPlanningStatusHandler.get(); }
+  CnrHandler    *cnrHandler() { return m_cnrHandler.get(); }
+
+private:
+  std::unique_ptr<DdsHandler>                      m_ddsHandler;
+  std::unique_ptr<DbHandler>                       m_dbHandler;
+  std::shared_ptr<DatabaseInterface>               m_dbInterface; //!< just to make sure we own a reference to it; we can then simply forward a plain pointer to our clients
+  std::unique_ptr<AVControl>                       m_avControl;
+  std::unique_ptr<FMControl>                       m_fmControl;
+  std::unique_ptr<ExercisesHandler>                m_exHandler;
+  std::unique_ptr<ActiveExercises>                 m_activeExercises;
+  std::unique_ptr<HandlerMenuStruct>               m_menuStructHandler;
+  std::unique_ptr<CnrHandler>                      m_cnrHandler;
+  std::unique_ptr<TvcHandler>                      m_tvcHandler;
+  std::unique_ptr<FrequencySetHandler>             m_frequencySetHandler;
+  std::unique_ptr<FrequencyPlanningHandler>        m_frequencyPlanningHandler;
+  std::unique_ptr<CnrTvcProfileHandler>            m_cnrTvcProfileHandler;
+  std::unique_ptr<StreamNameMappingPublisher>      m_streamNameMappingPublisher;
+  std::unique_ptr<HandlerVideoReceiver>            m_videoReceiverHandler;
+  std::unique_ptr<HandlerVideoTeam>                m_videoTeamHandler;
+  std::unique_ptr<HandlerFrequencyPlanningStatus>  m_frequencyPlanningStatusHandler;
+
+  NGL::INGLLogger                                 &m_logger;
+};
+
+} // namespace AudioVideoManagement