Use core NATS pub/sub for email-verified SSE fan-out

Shipped: April 19, 2026 at 3:11 AM UTC
Author: Kamo
Commit: e056053

Replaces in-memory ConcurrentHashMap broadcast with NATS core pub/sub so all pods receive verification events regardless of which pod handled the token. Falls back to in-memory if NATS is unavailable.

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