QCJ Avatar S4 PERSONAL ON/OFF Test Build (12.2.42.2)

1. Back up %LOCALAPPDATA%\QianChengJin\data before upgrading.
2. Unzip, run 安装本机共享数据库.bat to update the local service, preserve old DB.
3. In chrome://extensions, update / reload the extension directory from THIS ZIP.
4. Open 头像辅助 section, use 开启头像辅助 / 关闭头像辅助. Default: ON.
5. OFF stops new avatar submissions, profile handoffs and avatar finalization; ongoing avatar workers are paused when the service is reachable. Previously processed records and queued tasks remain untouched. Inflight inference may finish saving.
6. ON restores the avatar pipeline; workers paused by the switch are resumed. A worker that was never started still requires 启动头像处理 from the existing panel.
7. If you see a warning about local service connectivity, check the avatar worker status: the extension cannot confirm that a disconnected existing model process was paused.

No edits to Facebook content scripts, search/age/job rules, database schema or records. Windows live tests still pending.
