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/VideoOverlayManagement/avs_interface.h

@@ -0,0 +1,124 @@
+/**
+  * AVS-Interface for VideoOverlayManagement
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by hjl, SLSE, 2016-06-24
+  */
+
+#pragma once
+
+#include <QtCore/QObject>
+#include <QtNetwork/QHostAddress>
+#include "logger.h"
+
+// Forwarddeclarations
+class QTcpSocket;
+class QTimer;
+
+namespace VideoOverlayManagement
+{
+
+enum class AvsIfConnectionState
+{
+  Undefined = 0,
+  Connected,
+  Disconnected,
+  TryReconnect,
+  ConnectionError,
+};
+
+enum class AvsCmdState
+{
+  Ok                   = 200,
+  KeepAlive            = 298,
+  BadArguments         = 402,
+  CommandNotStateValid = 455
+};
+
+
+class AvsInterface
+  : public QObject
+{
+  Q_OBJECT
+public:
+  /**
+    * Constructor connect to plugboard
+    * @param[in] enableTryReconnect  if true, try reconnection
+    * @param[in] parent              Pointer to parent qObject
+    */
+  AvsInterface(bool enableTryReconnect, QObject *parent = nullptr);
+
+  ~AvsInterface();
+
+  /**
+    * Connect to AVS RCP_AVA
+    * @param[in] hostName        Hostname or Ip address to get access to AVS
+    * @param[in] port            Ip port to get access to AVS
+    */
+  void start(const QString &hostName, quint16 port);
+
+  AvsIfConnectionState getAvsIfState()
+  {
+    return m_avsIfConnectionState;
+  }
+
+  /**
+    * Send data to connected TcpSocket
+    * @param[in] qba   Data to be transfered completed with "\r\n"
+    */
+  bool sendCommand(const QByteArray &qba);
+
+
+Q_SIGNALS:
+  /**
+    * Signals current AVS connection state
+    */
+  void avsIfConnectionState(AvsIfConnectionState);
+  /**
+    * Signals current AVS command state
+    */
+  void avsCmdState(AvsCmdState);
+
+  /**
+    * Signals an missing AVS keep-alive
+    * If the parameter 'enableTryReconnect' is set
+    * the connection attempting to restore automatically
+    */
+  void avsKeepAliveTimeout();
+
+  /**
+    * Define the signal/slots connects uesd for TcpSocket
+    */
+protected Q_SLOTS:
+  void doConnect();
+  void onConnected();
+  void onDisonnected();
+  void onError(QAbstractSocket::SocketError);
+  void onReadyRead();
+  void onAvsKeepAliveTimeout();
+
+private: // methode
+  void tryReconnect();
+
+private: // attributes
+  QString m_hostName;           ///< Hostname or Ip address to get access to AVS
+  QString m_ipAddressDNS;       ///< DNS IP address of AVS
+  quint16 m_hostPort;           ///< Ip port to get access to AVS
+  qint32 m_waitTime;            ///< delay before try reconnection
+  bool m_enableTryReconnect;    ///< if true, enables try reconnection
+  bool m_tryReconnect;          ///< if true, try reconnection
+
+  QTimer *m_avsKeepAliveTimer;  ///< AVS keep-alive timer
+  qint32 m_keepAliveTime;       ///< AVS keep-alive time intervall in msec
+
+  AvsIfConnectionState m_avsIfConnectionState;      ///< AVS Interface connection state
+
+  QTcpSocket  *m_socket;        ///< pointer to tcpsocket object
+
+  QByteArray m_buffer;          ///< data buffer to hold incoming data form tcpsocket
+  NGL::INGLLogger  &m_logger;   ///< Interface to the Logging-Facility
+
+};
+
+} // namespace VideoOverlayManagement