RR.NU 被注册商 ClientHold，解析全掉

估计有人滥用，域名被注册商暂停解析了，和之前 us.kg 类似的。

rr.nu domain lookup results from nicewhois.com server:

state:            active
domain:           rr.nu
holder:           (not shown)
created:          1998-11-04
modified:         2025-04-24
expires:          2025-11-04
nserver:          ns1.sitelutions.com
nserver:          ns2.sitelutions.com
nserver:          ns3.sitelutions.com
nserver:          ns4.sitelutions.com
nserver:          ns5.sitelutions.com
dnssec:           unsigned delegation
registry-lock:    unlocked
status:           clientHold
registrar:        NuNames.NU