chinamobile, chinatelecom, chinabroadnet: add 3GPP public domains (#4168)

Add the mncXXX.mcc460.pub.3gppnetwork.org zones that are delegated to
each operator's own name servers:

- chinamobile: mnc000/002/004/007 (ns*.cnmobile.net, ns*.cmmobile.cn, AS9808)
- chinatelecom: mnc011 (ns*.chinanet.cn, AS4134)
- chinabroadnet: mnc015 (vip3/vip4.alidns.com)

A full NS scan of mnc000-999 under mcc460/mcc461 found no other
delegations (none for China Unicom). Results matched from Google/Cloudflare
DoH and from 223.5.5.5, 119.29.29.29 and 202.103.224.68 inside China.


Claude-Session: https://claude.ai/code/session_01XhAhSp4FJ44KxF1KjeBNto

Co-authored-by: Claude <noreply@anthropic.com>

data/chinabroadnet

@@ -18,3 +18,6 @@ isxtv.com
 
 # 山東省
 sdgdwljt.com
+
+# 3GPP 公网域 (IMS / VoWiFi)
+mnc015.mcc460.pub.3gppnetwork.org

data/chinamobile

@@ -48,3 +48,9 @@ cmdcxls.com
 cxzx10086.cn
 fxltsbl.com
 zdsdp.com
+
+# 3GPP 公网域 (IMS / VoWiFi)
+mnc000.mcc460.pub.3gppnetwork.org
+mnc002.mcc460.pub.3gppnetwork.org
+mnc004.mcc460.pub.3gppnetwork.org
+mnc007.mcc460.pub.3gppnetwork.org

data/chinatelecom

@@ -15,3 +15,6 @@ dlife.cn
 play.cn
 tv189.com
 vnet.cn
+
+# 3GPP 公网域 (IMS / VoWiFi)
+mnc011.mcc460.pub.3gppnetwork.org