fix(node): a removal made at the machine is in audit.db

The Node page and the CLI remove access through the loopback API, and
revoke and unpin there wrote nothing to audit.db; only the signed MNP door
did. A removed person's next connection then showed an auth_failed with
nothing before it to explain it. Both routes now record member_revoke and
member_unpin once the operation has succeeded, with the node's own account
as the actor and 127.0.0.1 as the address, which tells the two doors apart.
A refusal changes nothing and records nothing.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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