Background-task (/background, /btw) result media now routes to the
type-specific sender — TTS clip → voice bubble, video → send_video,
image → send_image_file — instead of forcing everything through
send_document. Mirrors the streaming + kanban delivery paths and
reuses base.should_send_media_as_audio for the Telegram OGG nuance.
Co-authored-by: LJ Li <liliangjya@gmail.com>
Co-authored-by: Kolektori <256073454+Kolektori@users.noreply.github.com>