fix: guard AI probe worker at shutdown, keep message teardown order - #647

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Include file: <QStandardPaths> not found. Please note: Cppcheck does not need standard library headers to get proper results.

Include file: <QCoreApplication> not found. Please note: Cppcheck does not need standard library headers to get proper results.

Include file: <QProcess> not found. Please note: Cppcheck does not need standard library headers to get proper results.

Include file: <QDebug> not found. Please note: Cppcheck does not need standard library headers to get proper results.

Include file: <QDBusInterface> not found. Please note: Cppcheck does not need standard library headers to get proper results.