Let a migrated account hand its address to coinos v3

A `migrated` flag on the user, settable through /user and visible on the
public user endpoint. It changes exactly one thing: lnurlp for that
username defers to the names registrar, so payments to [email protected]
arrive in the person's v3 wallet. The account itself is untouched — same
username, same history, still usable here — which is why this is a flag
and not a rename or a shutdown.

Co-Authored-By: Claude Fable 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Wvj4aoeMZwA7VUGdJP9Swi

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