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/Utils/fire_automaton.cpp

@@ -29,7 +29,7 @@ FireAutomaton::FireAutomaton(QObject *parent)
   , m_logger(getLogger("Utils.FireAutomaton"))
 {
   m_timer.setSingleShot(true);
-  connect(&m_timer, &QTimer::timeout, this, &FireAutomaton::nextTick, Qt::UniqueConnection);
+  connect(&m_timer, &QTimer::timeout, this, &FireAutomaton::nextTick);
 }
 
 /**