/queue rebuilt the queued MessageEvent with only text/type/source/
message_id/channel_prompt, silently dropping any photo, document, voice,
or reply context attached to the command. The deferred turn then ran with
the attachment lost. Carry the full payload through, and accept a /queue
that has media but no prompt text (e.g. "/queue" as an image caption).
Salvaged from #13913 by @ypwcharles — the gateway busy-session/queue
infrastructure was rewritten since that PR (Telegram moved to
plugins/platforms/, /queue now uses the FIFO chain), so the media fix is
reimplemented against the current handler; the PR's batching and
busy-bypass changes targeted code paths that no longer exist.
Co-authored-by: ypwcharles <92324143+ypwcharles@users.noreply.github.com>
