fix(watch): reduce graceful shutdown timeout from 5s to 500ms (#33099)
The 5-second grace period introduced in #32564 causes frustrating reload
delays during development when a SIGTERM handler is registered (e.g. for
production graceful DB shutdown). 500ms is enough time for most cleanup
tasks (closing connections, flushing logs) while keeping the dev reload
loop snappy.
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>