Yes, that should be WAN, but since you configured three NICs for OpenWrt, I'm unsure which one has become WAN. OpenWrt defaults to a DHCP client for WAN, but your output from ip addr did not list any IP address on the WAN interface.
it did work last time, I setup pfsense, but I don't have a USB-ethernet adapter right now.
third interface was by mistake.
this mini PC has only two NICs.
You can, of course, reconfigure the LAN interface to get an IP in the 192.168.8.0/24 range, but since OpenWrt provides a DHCP server by default, you will probably end up having two DHCP servers in your network.
right now I just want to set up this OpenWRT VM for testing 24.10.
so I am fine with two DHCP servers for testing OpenWRT only. this isn't for production use right now.
I cannot answer that about ssh from the PVE shell but my personal preference is to use MS Visual Studio as the SSH client on my desktop. I used to be big into Putty as the ssh application of choice but VS can do a lot so I switched.
I do not ssh from the PVE instance to anywhere. Cant say it is right or wrong, just not how I go about ssh access.
From the lcx interface you could just manually type out what you showed, that is not an overly large amount of typing.
Updated : Forgot you are trying to edit from within OpenWRT.
This is easier.. This is where I got my steps and they work great.
Specifically post 8 Post 8 for WAN web access and nano editor install