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/README.md

@@ -1,9 +1,15 @@
 # dockge
 
 Per-host [Dockge](https://dockge.kuma.pet/) — a lightweight web UI for
-the compose files in `/opt/docker/compose/`. Runs one instance on every
+managing the host's docker compose stacks. Runs one instance on every
 Docker host in the fleet.
 
+Default stacks root is `/opt/docker/compose/` (fleet convention).
+Hosts where `/opt/docker/` isn't writable by the deploying user
+override `DOCKGE_HOST_STACKS_ROOT` in their `.env` — corviduo-dev
+sets it to `/home/vh/docker` (vh lacks passwordless sudo on the
+worldtree-team-managed host; see `servers/corviduo-dev/README.md`).
+
 ## Layout
 
 - `compose.yaml` — canonical, same file pushed to every host