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/Proxies/TrainingAreaBase/main_handler.h

@@ -0,0 +1,118 @@
+/**
+  * MainHandler for TetraRadio
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Christian Ehrlicher, SLSE, 2016-04-14
+  */
+#pragma once
+
+#include <QObject>
+#include <memory>
+#include "exm_handler.h"
+#include "ism_handler.h"
+#include "pdm_handler.h"
+#include "ppm_handler.h"
+#include "tab_db.h"
+#include "dds_handler.h"
+#include "position_handler.h"
+#include "send_to_dds.h"
+#include "recv_from_dds_aes.h"
+#include "recv_from_dds_fts.h"
+#include "send_to_tab.h"
+#include "tx_mixin.h"
+#include <ProjectDataManagement/pdm_dtc.h>
+#include "tab_plugin_interface.h"
+#include "WebSocketInterface/websocket_interface_handler.h"
+#include <ngldb/db_service_handler.h>
+
+
+
+#include "logger.h"
+
+namespace NGLDB
+{
+template <typename DB> class DbServiceHandler;
+}
+
+namespace LtsPluginManager
+{
+struct PluginInstance;
+}
+
+namespace TrainingAreaBase
+{
+using DbHandler = NGLDB::DbServiceHandler<DatabaseInterface>;
+class MainHandler final : public QObject, public Plugin::DataProvider
+{
+  Q_OBJECT
+public:
+  explicit MainHandler(QObject *parent = nullptr);
+  ~MainHandler();
+
+  bool init(int domainId, int exerciseId);
+
+  std::shared_ptr<DdsHandler> ddsHandler() const { return m_ddsHandler; }
+  std::shared_ptr<DbHandler> dbHandler() const { return m_dbHandler; }
+  std::shared_ptr<DatabaseInterface> db() const { return m_dbHandler->db(); }
+
+  std::shared_ptr<RecvFromTab> rxHandler() const { return m_rxHandler; }
+  std::shared_ptr<RecvFromDdsFts> ftsHandler() const { return m_ftsHandler; }
+  std::shared_ptr<SendToTab> txHandler() const { return m_txHandler; }
+  std::shared_ptr<RecvFromDdsAes> aesHandler() const { return m_aesHandler; }
+  std::shared_ptr<ExmHandler> exmHandler() const { return m_exmHandler; }
+  std::shared_ptr<IsmHandler> ismHandler() const { return m_ismHandler; }
+  std::shared_ptr<PdmHandler> pdmHandler() const { return m_pdmHandler; }
+  std::shared_ptr<PpmHandler> ppmHandler() const { return m_ppmHandler; }
+  std::shared_ptr<PositionHandler> posHandler() const { return m_posHandler; }
+
+  // Plugin::DataProvider
+  int exerciseId() const override { return m_ddsHandler->ddsConnector()->getPartitionId(); }
+  bool useTetraScrambling() const override;
+  ProjectDataManagement::RadioGroup exerciseRadioGroup() const override;
+  TetraIcd::ExerciseEnvironmentData exerciseEnvironmentData() const override;
+  TetraIcd::ExerciseStateData exerciseStateData() const override;
+  TetraIcd::ExerciseEquipmentAssignmentComplete exerciseEquipmentAssignment() const override;
+  QVector<TetraIcd::TrainingAreaTelegram*> aesTelegrams() const override;
+  QSqlDatabase databaseConnection() const override;
+  QString databaseSchemaName() const override;
+  int domainId() const override;
+
+  const std::vector<std::shared_ptr<Plugin::Interface>> &getPluginList() const { return m_interfaces; }
+
+private Q_SLOTS:
+  void onExerciseChanged(const ExerciseManagement::Exercise &data, DataModification modType);
+  void onExercise2RadioGroupChanged();
+  void onConnectionState(const QString &name, bool connectionState);
+  void onDirectMessage(const QByteArray &jsonMessage);
+  void onPositionChanged(int equipNo, const ParticipantManagement::ParticipantPosition &pos);
+
+private:
+  bool loadPlugin(const LtsPluginManager::PluginInstance &pi);
+  QString getErrorString(const ParticipantManagement::BiteError &error) const;
+  QString getCanDeviceName(int id) const;
+  QString getSubDeviceName(int id) const;
+private:
+  std::shared_ptr<DdsHandler> m_ddsHandler;
+  std::shared_ptr<DbHandler> m_dbHandler;
+  std::shared_ptr<RecvFromTab> m_rxHandler;
+  std::shared_ptr<RecvFromDdsFts> m_ftsHandler;
+  std::shared_ptr<TxMixin>        m_txHandler;
+  std::shared_ptr<RecvFromDdsAes> m_aesHandler;
+  std::shared_ptr<IsmHandler> m_ismHandler;
+  std::shared_ptr<ExmHandler> m_exmHandler;
+  std::shared_ptr<PdmHandler> m_pdmHandler;
+  std::shared_ptr<PpmHandler> m_ppmHandler;
+  std::shared_ptr<PositionHandler> m_posHandler;
+  std::vector<std::shared_ptr<Plugin::Interface>> m_interfaces;
+  std::shared_ptr<WebSocketInterface::WebSocketInterfaceHandler> m_handlerWebSocket;
+
+
+  ExerciseManagement::Exercise m_exerciseData;
+  QMap<int, ProjectDataManagement::CanComponentString> m_ccsMap;
+  QMap<int, ProjectDataManagement::BiteComponentText>  m_bctMap;
+  QMap<QString, bool> m_ifcConnectionState;
+
+  LOGGER_T m_logger;
+};
+} // namespace TrainingAreaBase