* add single-led support for SenseCAP Watcher * Rename blaklight.cc to backlight.cc
* feat: add sensecap watcher board. * feat(sensecap): Add button function. * fix: fix compilation error. * style:Modify code style. * fix: fix wake bug * fix: fix compilation error & Enable click to toggle state. * style: move sensecap_audio_codec files to sensecap board * fix: Optimize shutdown.