Adds an opt-out toggle on PlatformConfig that gates both restart
lifecycle pings: the "♻ Gateway restarted" message sent to the chat
that issued /restart, and the "♻️ Gateway online" home-channel
startup notification. Defaults to True so existing deployments are
unaffected.
The motivating split is operator vs. end-user surfaces: a back-channel
like Telegram should keep these pings, while a Slack workspace shared
with end users should not surface gateway lifecycle noise.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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