Cherry-picked from PR #2319 by @itenev.
When the gateway fails to connect (e.g. PrivilegedIntentsRequired,
missing token), systemd's default RestartSec=10 with no start rate
limit causes rapid reconnect storms flooding logs and triggering
platform-side rate limits.
- StartLimitIntervalSec=600 + StartLimitBurst=5 in [Unit] (max 5
restarts per 10 min)
- RestartSec: 10 → 30
- Applied to both templates in gateway.py and scripts/hermes-gateway
326b146d68