fix(client): publish the real local IP on every platform, not just win32

Chromium replaces host candidates with random `<uuid>.local` mDNS names.
aioice has no mDNS resolver on any platform: it logs `Remote candidate
"<uuid>.local" could not be resolved` and drops the candidate. Concealment
therefore does not degrade for us, it deletes the only LAN-routable
candidate and leaves reflexive pairs -- which fail whenever both peers are
behind the same NAT, because that pair needs the router to hairpin.

Measured with a Linux client and a node in a libvirt guest: exactly one pair
formed, host -> srflx on a shared public address, five binding requests, zero
responses, FAILED after 63 s. The same log shows a peer on the guest's own
subnet succeeding in 24 ms with a real-IP host candidate.

5022f2b scoped this to win32 from a session where the guest ran the *client*,
so the condition encoded "the machine being debugged" rather than "the peer
is a node". The peer is always a node, on every platform.

The trade is that our private address reaches the hub and the node in the
SDP -- the user's own infrastructure, not an arbitrary page.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DtfG7z6wHWj8RKHCvxQtY1

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