DNS: change error loglevel for DOH for NXDOMAIN

[patterniha]

dns-query-answer for some domains contains no ip, NXDOMAIN

nslookup jkasssahdjashdjh.com

-> server can't find jkasssahdjashdjh.com: NXDOMAIN

in Xray-core when dns is DOH and and dns-query answer has no ip (NXDOMAIN), an error-log is created and printed:

2025/03/27 17:09:46.372277 [Error] app/dns: failed to retrieve response for jkasssahdjashdjh.com. > Post "https://free.shecan.ir/dns-query": context canceled

this log is only shown for DOH-dns, and we have no log for other types of dns.

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some apps in android constantly asking for IP of an invalid domain(NXDOMAIN), this causes thousands of unnecessary logs in v2rayNG and slows down the app.

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this is only a temporary solution.(and only for log)

[patterniha]

Also, I think NXDOMAIN should be cache for 2 minutes to avoid consecutive requests which, in addition to the log, also has a negative impact on the network.

@Meo597 I think this is yours.

[Fangliding]

还是 #3784
NXDOMAIN 不缓存错误 导致N次请求最终爆炸 主流DOH服务器的行为如果连续query相同的请求会返回400 只是返回这个err叫context canceled
还是我在PR标题写的那句话

是否要其他人为这些DNS灵车爱好者买单？

这不 买单的来了 如果不是Yuhan觉得应该修按我当时的判断就是直接关了 那个pr当初没加配置项是因为不想在配置文件堆垃圾 不过我想你们俩现在应该也都知道怎么加字段了 那就继续扩这没啥人用的字段就行了 我管不着了