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/WebSocketInterface/data_manager.cpp

@@ -0,0 +1,49 @@
+/**
+  * @RDE_HEADER@
+  * The DataManager class handles data to be send to the websocket
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Philipp Dassow, SLST, 2017-12-05
+  */
+#include "data_manager.h"
+#include "Messages/reply_message.h"
+#include "main_handler.h"
+#include "json_keys.h"
+#include <ngldb/nsqlquery.h>
+
+namespace TrainingAreaBase
+{
+namespace WebSocketInterface
+{
+
+static int s_requestId = 1;
+//---------------------------------------------------------------------------------------------------------
+DataManager::DataManager(MainHandler *mainHandler)
+  : LtsWebSocket::DataManagerBaseDl<DatabaseInterface>(mainHandler->db(), getLogger("DataManager"))
+  , m_mainHandler(mainHandler)
+
+{}
+//---------------------------------------------------------------------------------------------------------
+
+LtsWebSocket::ReplyMessage* DataManager::sendBiteRequest(const QString &uuid, int equipNo)
+{
+  DemandBiteRequest request;
+  request.equipmentNumbers().push_back(equipNo);
+  request.withSelfTest(true);
+  request.requestId(s_requestId++);
+
+  rti::core::SampleIdentity sampleIdentity;
+  m_mainHandler->ftsHandler()->onDemandBiteRequest(sampleIdentity, request);
+
+
+  Messages::OkMessage::OkData data;
+
+  data.messageType = JsonKeys::OK();
+  data.info        = QStringLiteral("BiteRequest sent");
+  data.uuid        = uuid;
+
+  return new Messages::OkMessage(data);
+}
+} // namespace WebSocketInterface
+} // namespace TrainingAreaBase