fix: move StartLimitIntervalSec/Burst to [Unit] for older systemd compat

Older systemd (< 230, common on Pi OS Buster/Bullseye) rejects these
keys in [Service] with 'Unknown key' warning and ignores them, meaning
no restart rate-limiting was enforced.

Also includes pi-setup.sh fix for hardcoded user/home from previous session.

scripts/infoscreen-simclient.service

@@ -6,6 +6,9 @@ After=network-online.target
 Wants=network-online.target
 # Publish an MQTT alert if systemd gives up restarting (StartLimitBurst exceeded).
 OnFailure=infoscreen-notify-failure@%n.service
+# StartLimit* must live in [Unit] for compatibility with older systemd (< 230).
+StartLimitIntervalSec=60
+StartLimitBurst=5
 
 [Service]
 # notify: simclient sends READY=1 via sd_notify once fully initialised.
@@ -33,12 +36,6 @@ ExecStart=/home/olafn/infoscreen-dev/scripts/start-simclient.sh
 #      publishes completed — closing the lifecycle cleanly.
 Restart=on-failure
 RestartSec=10
-
-# Prevent rapid restart thrash: allow at most 5 restarts in 60 seconds.
-StartLimitIntervalSec=60
-StartLimitBurst=5
-
-# Logging
 StandardOutput=journal
 StandardError=journal
 SyslogIdentifier=infoscreen-simclient