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/audio_video_handler.cpp

@@ -0,0 +1,188 @@
+/**
+  * @RDE_HEADER@
+  * AudioVideoHandler
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Christian Fröbel, SLSE, 2017-11-27
+  */
+
+#include "audio_video_handler.h"
+#include "audio_video_handler_impl.h"
+#include "asset.h"
+#include "mounting_point.h"
+#include "exercise_handler.h"
+#include "default_av_menus.h"
+#include <AudioVideoManagement/avm_dts.h>
+#include <AudioVideoManagement/avm.hpp>
+#include <InfrastructureManagement/ism.hpp>
+#include <QtGlobal>
+#include <map>
+#include <utility>
+
+
+namespace AudioVideoManagement
+{
+
+/**
+ * All DB-operations are done via this class in order to keep an internal cache
+ * that mirrors the entries in the DB.
+ * Initially there are no entries as the ExercisesHandler removes all
+ * device-related entries from the DB.
+ */
+class AudioVideoHandler::DbProxy : public AudioVideoHandlerImpl::IDbProxy
+{
+public:
+  explicit DbProxy(DatabaseInterface *db)
+    : m_db(db)
+  {
+    Q_ASSERT(db);
+  }
+
+  const Streams &findStreams(AssetId id) const override
+  {
+    auto   found = m_cache.find(id);
+    Q_ASSERT(found != m_cache.end());
+    return found->second;
+  }
+
+  const Streams &findStreams(Asset *asset) override
+  {
+    Q_ASSERT(asset);
+    return findStreams(asset->data().id());
+  }
+
+  void insert(Streams &streams) override
+  {
+    Q_ASSERT(streams.first.id <= 0);
+
+    m_db->insert(streams.first);
+
+    if (streams.second)
+    {
+      Q_ASSERT(streams.second->id <= 0);
+      streams.second->link = streams.first.id;
+      m_db->insert(*streams.second);
+
+      streams.first.link = streams.second->id;
+      m_db->update(streams.first);
+    }
+
+    auto   insertResult = m_cache.insert(std::make_pair(streams.assetId(), streams));
+    Q_ASSERT(insertResult.second);
+  }
+
+  void update(Streams &newStreams) override
+  {
+    Q_ASSERT(newStreams.first.id <= 0);
+    Q_ASSERT(!newStreams.second || newStreams.second->id <= 0);
+
+    auto      found = m_cache.find(newStreams.assetId());
+    Q_ASSERT(found != m_cache.end());
+    const Streams   oldStreams = found->second;
+
+    // The update of the Asset can also imply that an additional stream will be created
+    // or that one stream will be removed.
+
+    if (!oldStreams.second && !newStreams.second)
+    {
+      // no change, one stream
+      newStreams.first.id = oldStreams.first.id;
+      m_db->update(newStreams.first);
+    }
+    else if (oldStreams.second && newStreams.second)
+    {
+      // no change, two streams
+      newStreams.first.id     = oldStreams.first.id;
+      newStreams.first.link   = oldStreams.first.link;
+      newStreams.second->id   = oldStreams.second->id;
+      newStreams.second->link = oldStreams.second->link;
+      m_db->update(newStreams.first);
+      m_db->update(*newStreams.second);
+    }
+    else if (!oldStreams.second && newStreams.second)
+    {
+      // one additional stream
+      newStreams.second->link = oldStreams.first.id;
+      m_db->insert(*newStreams.second);
+
+      newStreams.first.id = oldStreams.first.id;
+      newStreams.first.link = newStreams.second->id;
+      m_db->update(newStreams.first);
+    }
+    else
+    {
+      // one stream removed
+      newStreams.first.id = oldStreams.first.id;
+      m_db->update(newStreams.first);
+      m_db->removeAvmDeviceConfig(oldStreams.second->id);
+    }
+
+    found->second = newStreams; // update cache
+  }
+
+  void remove(Asset *asset) override
+  {
+    Q_ASSERT(asset);
+    auto   found = m_cache.find(asset->data().id());
+    Q_ASSERT(found != m_cache.end());
+    const Streams   &streams = found->second;
+
+    m_db->removeAvmDeviceConfig(streams.first.id);
+    if (streams.second)
+      m_db->removeAvmDeviceConfig(streams.second->id);
+
+    m_cache.erase(found);
+  }
+
+private:
+  std::map<AssetId, Streams>   m_cache;
+  DatabaseInterface           *m_db;
+};
+
+
+class AudioVideoHandler::DtsProxy : public AudioVideoHandlerImpl::IDtsProxy
+{
+public:
+  DtsProxy(Interface::Dts *dts, DefaultAvMenus *defaultAvMenus)
+    : m_dts(dts)
+    , m_defaultAvMenus(defaultAvMenus)
+  {
+    Q_ASSERT(dts);
+    Q_ASSERT(defaultAvMenus);
+  }
+
+  void publish(const Stream &stream) override
+  {
+    m_defaultAvMenus->onStreamChanged(stream);
+    m_dts->publish(stream);
+  }
+
+  void remove(uint64_t streamId) override
+  {
+    m_defaultAvMenus->onStreamRemoved(streamId);
+    m_dts->removeStreamByKey(streamId);
+  }
+
+private:
+  Interface::Dts   *m_dts;
+  DefaultAvMenus   *m_defaultAvMenus;
+};
+
+
+AudioVideoHandler::AudioVideoHandler(Exercise *exercise, ExerciseHandler *exerciseHandler, DefaultAvMenus *defaultAvMenus, DatabaseInterface *db, Interface::Dts *dts)
+  : m_dbProxy(new DbProxy(db))
+  , m_dtsProxy(new DtsProxy(dts, defaultAvMenus))
+  , m_impl(new AudioVideoHandlerImpl(exercise, m_dbProxy.get(), m_dtsProxy.get()))
+{
+  Q_ASSERT(exerciseHandler);
+
+  connect(m_impl.get(), &AudioVideoHandlerImpl::avDbReloadNeeded, this, &AudioVideoHandler::avDbReloadNeeded);
+
+  connect(exerciseHandler, &ExerciseHandler::contextActivated, m_impl.get(), &AudioVideoHandlerImpl::onContextActivated);
+  connect(exerciseHandler, &ExerciseHandler::contextDeactivated, m_impl.get(), &AudioVideoHandlerImpl::onContextDeactivated);
+}
+
+AudioVideoHandler::~AudioVideoHandler() = default;
+
+} // namespace AudioVideoManagement