dockge: parameterize stacks-root path + deploy on corviduo-dev

Made the host-stacks bind-mount path configurable via
DOCKGE_HOST_STACKS_ROOT (default /opt/docker, unchanged for the
existing five hosts). Override on corviduo-dev to /home/vh/docker
because that host's /opt/ is owned by deploy:deploy (Worldtree team)
and vh lacks passwordless sudo for the fleet-standard path — same
reasoning as the beszel + dozzle agent placement earlier today.

Deployed to corviduo-dev. Reachable at http://10.250.50.152:5001
(first probe 200 — Docker's port-mapping route through iptables
worked without firewall changes, unlike beszel's network_mode: host).

Scoped to PFI-managed stacks only (/home/vh/docker/compose/) — does
NOT see /opt/worldtree*/ deployments. Keeps the management boundary
clean: dockge can restart/recreate PFI's beszel+dozzle+itself but
not the Worldtree-team-owned containers.

stacks/dockge/.env.example

@@ -20,4 +20,13 @@ DOCKGE_HOST_LABEL=
 #   nh3-docker     → 10.100.50.40
 #   esh-docker-vm  → 10.0.50.45
 #   vm-esh-nas     → 10.0.50.154
+#   corviduo-dev   → 10.250.50.152
 DOCKGE_HOST_IP=
+
+# Host directory containing the per-stack compose dirs. Default
+# /opt/docker matches the fleet convention. Override only for hosts
+# where /opt/docker isn't writable / appropriate.
+#   corviduo-dev   → /home/vh/docker
+# Trailing slash NOT required. Dockge sees the .../compose/ subdir
+# as its stacks root (DOCKGE_STACKS_DIR derives from this).
+DOCKGE_HOST_STACKS_ROOT=/opt/docker