feat(v0.3): watchdog-конфиг (B05/A14) + save-time timer (B07)

P7.3: watchdog-shturman.conf (system.conf.d: RuntimeWatchdogSec/RebootWatchdogSec —
дисциплина; реальный /dev/watchdog + MCU-backstop — HW/v0.4). shturman-savetime.service/
.timer — periodic fake-hwclock save в /data (~5 мин).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Signed-off-by: Alexander <akotenev2003@gmail.com>

systemd/shturman-savetime.service

@@ -0,0 +1,9 @@
+[Unit]
+Description=Штурман save last-known-time (fake-hwclock → /data, B07)
+After=data.mount
+Requires=data.mount
+
+[Service]
+Type=oneshot
+# FILE из /etc/default/fake-hwclock (→ /data; v0.6). Сервис fake-hwclock в Lima masked → зовём напрямую с env.
+ExecStart=/bin/sh -c '. /etc/default/fake-hwclock 2>/dev/null; FILE="${FILE:-/data/state/fake-hwclock.data}" fake-hwclock save'

systemd/shturman-savetime.timer

@@ -0,0 +1,9 @@
+[Unit]
+Description=Штурман periodic save-time (B07)
+
+[Timer]
+OnBootSec=2min
+OnUnitActiveSec=5min
+
+[Install]
+WantedBy=shturman-stage2.target

systemd/watchdog-shturman.conf

@@ -0,0 +1,6 @@
+# Watchdog (B05/A14): systemd пингует HW-watchdog в runtime + дедлайн на shutdown-фазу.
+# Установка: /etc/systemd/system.conf.d/shturman-watchdog.conf. В VM /dev/watchdog нет → дисциплина
+# (реальный HW-арминг + MCU-backstop — v0.4, VM↔HW-граница как zram/vcan в v0.6).
+[Manager]
+RuntimeWatchdogSec=30s
+RebootWatchdogSec=60s