Add a lazy Redis client constructor and an in-memory fallback for the
refresh-session store, plus tenant-api and ops-api bootstrap that warns
and continues with the lazy client instead of failing. Refresh and
blacklist operations now silently fall back to the in-memory store while
Redis is down so existing sessions stay valid until it recovers.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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