The old defaults (StartLimitIntervalSec=600, StartLimitBurst=5,
RestartSec=30) meant any network outage over ~5 minutes would
permanently kill the gateway until manual intervention.
Changes:
- StartLimitIntervalSec=0 (never give up)
- Restart=always (not just on-failure)
- RestartSec=60 with RestartMaxDelaySec=300, RestartSteps=5
(exponential backoff: 60 → 120 → 180 → 240 → 300s cap)
- After=network-online.target + Wants= (both units now wait for
actual connectivity, not just network.target)
Power outage → internet down → internet back = auto-recovery.
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