In trusted-proxy mode, sharedAuthResult is null because hasSharedAuth
only triggers for token/password in connectParams.auth. But the primary
auth (authResult) already validated the trusted-proxy — the connection
came from a CIDR in trustedProxies with a valid userHeader. This IS
shared auth semantically (the proxy vouches for identity), so operator
connections should be able to skip device identity.
Without this fix, trusted-proxy operator connections are rejected with
"device identity required" because roleCanSkipDeviceIdentity() sees
sharedAuthOk=false.
(cherry picked from commit e87048a6a650d391e1eb5704546eb49fac5f0091)
