fix(client): resolve STUN hostnames in the main process

Chromium's P2P socket manager failed every STUN hostname with
ERR_NAME_NOT_RESOLVED in a restricted-resolver environment (a Windows KVM
guest), even though its own general network stack, the OS resolver and
Node's resolver all resolved the same names -- and mapping the names to IPs
with --host-resolver-rules changed nothing, so it is not ordinary
resolution. WebRTC was left with no server-reflexive candidate.

The desktop client now resolves the STUN hostnames in the main process
(`ice:resolve-stun`, Node's dns.resolve4) and hands `transport.js` the
IP form; a name that will not resolve (the decommissioned Mozilla host) is
dropped. In a browser there is no `meshbay` bridge and the hostnames are
used unchanged -- a browser resolves them fine, so that path is untouched.
Falls back to the hostname form if the bridge call throws.

Also, scoped to win32: disable WebRtcHideLocalIpsWithMdns, so the client
publishes its real local IP instead of a `.local` name the node's ICE stack
cannot resolve across the KVM bridge. Changes nothing on Linux/macOS.
Test-env workaround, revisit before release.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

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