Lts/Services: finalize Qt6/C++17 migration cleanup

Remove deprecated Qt5 patterns remaining in Services:

- Replace remaining SIGNAL/SLOT string syntax with function pointer syntax
  (NmeaManagement/socket_handler.cpp, AudioVideoManagement/ModuleTests/mvs_tests.cpp)

- Remove Qt::UniqueConnection (deprecated in Qt6, default behavior) from
  19 files across AES, CES plugins, and cross-services (47 occurrences)

- Remove umbrella #include <QtCore> from fire_automaton.h and
  aes_test_fire_automaton.h (specific includes suffice)

25 files changed, 74 insertions(+), 81 deletions(-)

qt6-after/qt6-migrated-legatus/Lts/Services/AreaEffectSimulation/object_functional_area.cpp

@@ -49,7 +49,7 @@ Core::FunctionReplyObject ObjectFunctionalArea::createObject(const Database::Aes
     m_timer = new QTimer(this);
 
     connect(m_timer, &QTimer::timeout,
-            this, &ObjectFunctionalArea::myTimerSlot, Qt::UniqueConnection);
+            this, &ObjectFunctionalArea::myTimerSlot);
 
     DEBUG_LOG(m_logger) << "connect participantPositionChanged";
     connect(m_mainHandler->dds()->ppmDtc().get(), &ParticipantManagement::Interface::Dtc::participantPositionChanged,