feat: Accept link-local addresses as direct connection addresses.

I found that `netwatch` only accepts `link-local` addresses when no available IPv4 or IPv6 addresses are present. In my test environment, there are two devices, `A` and `B`, connected directly via an Ethernet cable. Device A is assigned the IP address `169.254.142.1`, and Device B is assigned `169.254.142.17`. Since Device B is a `multi-interface` device and can connect to the internet, netwatch filters out `link-local` addresses. However, Device A only has a `link-local` address, which prevents them from communicating.