ops(u13,fv-ml1): E2 in progress — nh3-dev app units, terminal origin via seat-host; fv-ml1 serial console + SOL logger staged

- configs/svos-apps/nh3-dev/: user units for svos-terminal (running),
  svos-postoffice, svos-miranda, svos-agent (installed, not yet started).
- configs/svos-front/Caddyfile: svos-terminal.phasefinal.com upstreams to
  https://svos-seathost.nh3.phasefinal.com now that app-terminal runs on nh3-dev.
- configs/fv-ml1-sol/: an nh3-dev user unit holding fv-ml1's BMC SOL session
  into the journal; fv-ml1's kernel console goes to ttyS1 (the SOL port,
  marker-tested) from its next boot (ZFSBootMenu commandline on zroot/ROOT).

configs/svos-apps/nh3-dev/svos-postoffice.service

@@ -0,0 +1,21 @@
+# eshpfi configs/svos-apps/nh3-dev/ (infra-ops, U13 2026-10-11): the althing bridge (app-postoffice) as lkraven, the
+# herald's user, because it owns the miranda handle's box-local push route. The kernel calls it over plain LAN HTTP.
+# Config /var/lib/svos/config/apps/postoffice.toml; credential /etc/svos/env/postoffice.env (vault nh3-svos/svos-postoffice-credential).
+[Unit]
+Description=SVOS Post office bridge (app-postoffice, U9a)
+ConditionPathExists=/etc/svos/env/postoffice.env
+[Service]
+Type=simple
+UMask=0077
+Restart=on-failure
+RestartSec=3
+TimeoutStopSec=20
+WorkingDirectory=/var/lib/svos
+EnvironmentFile=/etc/svos/env/postoffice.env
+Environment=SVOS_KERNEL_URL=https://svos-kernel.phasefinal.com
+Environment=SVOS_DATA_ROOT=/var/lib/svos
+Environment=SVOS_APP_LISTEN=10.100.10.50:8406
+Environment=ALTHING_POST_OFFICE=http://10.100.50.40:8390
+ExecStart=/opt/svos/current/apps-env/bin/svos-postoffice
+[Install]
+WantedBy=default.target