vpn.peer-config returned the config exactly as stored at creation time, so
after a node moves networks the reused companion peer's QR encodes the old
location's address (seen on .116: Endpoint = 10.125.9.0 from the previous
LAN) and the tunnel can never connect. Rewrite the Endpoint line with the
node's current address before rendering the QR, and persist it back so the
downloadable .conf matches. Endpoint detection is shared with
vpn.create-peer via current_wg_endpoint_host().
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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