Upgrade 0.22.0 to 1.0.2 (macOS 15.1.1): host VPN does not work within vzNAT VM (but slirp does)

### Description

### Description

Host macOS 15.1.1 (24B91) with VPN from corporate that uses HTTP proxy.

With 0.22.0 vzNAT worked fine in combination with VPN+proxy.

default networking works:
```
limactl start \
--name=proxytestok \
--cpus=4 \
--memory=8 \
--vm-type=vz \
--rosetta \
--mount-type=virtiofs \
--mount-writable
template://ubuntu

.... inside VM

curl -x http://www.google.com -v
(works)
```

vzNAT does not work:
```
limactl start \
--name=proxytestbad \
--cpus=4 \
--memory=8 \
--vm-type=vz \
--rosetta \
--mount-type=virtiofs \
--mount-writable \
--network=vzNAT \
template://ubuntu

... inside VM

curl -x http://www.google.com -v

* Trying :8080...
* Connected to () port 8080
> GET http://www.google.com/ HTTP/1.1
> Host: www.google.com
> User-Agent: curl/8.9.1
> Accept: */*
> Proxy-Connection: Keep-Alive
>
* Request completely sent off

(hangs)

```