bump to opte version 41, add v4 over v6 static routes

[rcgoodfellow]

OPTE Version Bump

OPTE version bump to go along with:

• Set OPTE maximum port MTU during creation opte#984

Fix Omicron Dependency Loop

PR #720 introduced a dependency from mg-admin-client to mg-common which depends on a large number of omicron crates. Since omicron imports mg-admin-client this creates a dependency mess in omicron. So I'm cutting off the dependency here and adding a CI test that ensures none of the client or API type crates can depend on omicron.

Also adds a CI script to ensure that an omicron dependency loop does not creep back in.

Support for Static IPv4 Routes Over IPv6 Nexthops

This was an oversight in the initial IPv4 over IPv6 routing support.

[taspelund]

Looks good to me overall. I asked claude to do a quick spotcheck and it had a couple bits of feedback on the CI script.

• No set -euo pipefail. Without pipefail, cargo tree | grep omicron masks cargo tree failures — if cargo tree errors out (lockfile drift, network) and prints nothing to stdout, grep returns 1 and the check "passes". Add set -euo pipefail and run cargo tree to a file (or cargo tree --quiet --prefix none) before grepping.
• cargo tree without --all-features / per-feature sweep can miss feature-gated omicron deps. Consider cargo tree -e normal --all-features or iterating features.
• pushd $1 unquoted; doesn't verify the dir exists. Minor.
• The check covers mg-admin-client, ddm-admin-client, ddm-api-types, mg-api-types. Worth confirming mg-api-types-versions (now a workspace dep of mg-admin-client) is also clean, or add it to the list.

[taspelund]

Is cargo fmt sorting this in lexicographical order instead of numerical? or can we adjust to use numerical order for readability?

[taspelund]

v4 over v6 work looks clean to me. only one nit about module sorting order in mg-api-types, but I'm not feeling overly motivated to fight rustfmt/cargo fmt if it's not a simple change