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/tab_plugin_interface.h

@@ -0,0 +1,86 @@
+/**
+  * Base class which provides a common class to get tx/rx handler
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Christian Ehrlicher, SLSE, 2016-09-26
+  */
+#pragma once
+
+#include <QObject>
+#include <memory>
+
+#include <ProjectDataManagement/pdm.hpp>
+
+#include "training_area_telegrams.h"
+
+class QSqlDatabase;
+namespace NGL
+{
+class Settings;
+}
+namespace TrainingAreaBase
+{
+class DdsHandler;
+class SendToTab;
+class TxMixin;
+
+class RecvFromTab;
+namespace Plugin
+{
+class Interface;
+class DataProvider
+{
+public:
+  DataProvider() = default;
+  virtual ~DataProvider() = default;
+
+  virtual int exerciseId() const = 0;
+  virtual bool useTetraScrambling() const = 0;
+  virtual ProjectDataManagement::RadioGroup exerciseRadioGroup() const = 0;
+  virtual TetraIcd::ExerciseEnvironmentData exerciseEnvironmentData() const = 0;
+  virtual TetraIcd::ExerciseStateData exerciseStateData() const = 0;
+  // returns a container which contains the assignment of the equipments to an exercise
+  virtual TetraIcd::ExerciseEquipmentAssignmentComplete exerciseEquipmentAssignment() const = 0;
+  virtual QVector<TetraIcd::TrainingAreaTelegram*> aesTelegrams() const = 0;
+  virtual QSqlDatabase databaseConnection() const = 0;
+  virtual QString databaseSchemaName() const = 0;
+  virtual int domainId() const = 0;
+};
+
+class Plugin
+{
+public:
+  Plugin() = default;
+  virtual ~Plugin() = default;
+  // This createInterface Method is used for Plugins that have a websocket server and need to register a port in the service management 
+  virtual std::shared_ptr<Interface> createInterface(DataProvider *pdp,
+                                                     const std::shared_ptr<RecvFromTab> &recvFromTabCb,
+                                                     const std::shared_ptr<TxMixin> &sendToTabCb,
+                                                     const std::shared_ptr<TrainingAreaBase::DdsHandler> &ddsHandler,
+                                                     NGL::Settings *settings) = 0;
+};
+
+class Interface : public QObject
+{
+  Q_OBJECT
+public:
+  Interface() = default;
+  virtual ~Interface() = default;
+
+  virtual bool init() = 0;
+  virtual std::shared_ptr<SendToTab> sendToTab() = 0;
+  virtual bool isDebugInterface() const = 0;
+  virtual bool canSendData() const = 0;
+  virtual void exerciseChanged () = 0;
+  virtual const char *name() const = 0;
+
+  virtual bool turnOn(bool turnOn) { Q_UNUSED(turnOn); return false; } // Plugins can reimplement this method for turn on/off.
+
+signals:
+  void connectionState(const QString &name, bool connectionState);
+  void directMessage(const QByteArray &jsonMessage);
+};
+} // namespace Plugin
+} // namespace TrainingAreaBase
+Q_DECLARE_INTERFACE(TrainingAreaBase::Plugin::Plugin, "special:3:tetra")