bugfix: one client only one sse connection

feat: optimize SSE data delivery, add uptime format, refresh interval…

…, Simplified Chinese and color themes

add quick start & update docs

add 2FA authentication (TOTP), change ORM to goent

add PID_FILE,RESTART_CMD,PRE_ACTION items, process daemonize detectio…

…n, status cache fixes

Add stdout/stderr log switching, fix config save path and split apply…

…/save, process PID/race issues; replace restarts with memory display

Refactor weblite as standalone, add config save/pidfile, optimize mem…

…ory, fix file serving