如何将附录放在backmatter后同时对附录进行编号？ about forum HOT 6 CLOSED

\documentclass{ctexbook}

\begin{document}
\frontmatter
\tableofcontents
\listoffigures

\mainmatter
\chapter{title}
\chapter{title}
\begin{figure}
  \fbox{text}
  \caption{text}
\end{figure}

% backmatter settings
\makeatletter
\if@openright
  \cleardoublepage
\else
  \clearpage
\fi
\makeatother
\setcounter{chapter}{0}
\renewcommand{\thechapter}{\Alph{chapter}}
\ctexset{
  chapter/name={附录,},
  chapter/number=\Alph{chapter},
}

\chapter{title}
\begin{figure}
  \fbox{text}
  \caption{text}
\end{figure}
\chapter{title}
\end{document}