feat(sub): opt-in dns and sniffer from remote Clash rules (#6868)

Public Mihomo templates ship rules, rule-providers and proxy-groups together
with a dns block those rules depend on (fake-ip ranges, nameserver policy).
Pasting a template inline keeps its dns, but pointing the global routing rules
at its URL dropped it, so URL users had to give up auto-refresh to keep it.

A new switch, subClashRemoteDNS (off by default), also takes the remote dns and
sniffer maps. It is opt-in because a remote dns block decides where clients send
every lookup. A malformed dns or sniffer value is skipped, not the whole template.
The component-test teardown now outlasts AntD Form's 10ms error debounce, which
otherwise fired after jsdom was gone.

internal/web/translation/en-US.json

@@ -1428,6 +1428,8 @@
       "subClashEnableRoutingDesc": "Include global Clash/Mihomo routing rules in generated YAML subscriptions.",
       "subClashRoutingRules": "Global routing rules",
       "subClashRoutingRulesDesc": "Paste inline rules/YAML or one permanent HTTPS URL. The panel refreshes it in the background, imports only groups/providers/rules, preserves generated VPN nodes and keeps the last valid value.",
+      "subClashRemoteDNS": "Use DNS from remote rules",
+      "subClashRemoteDNSDesc": "When the global routing rules field is a URL, also take its dns and sniffer sections. Enable only for a template you trust.",
       "subListen": "Listen IP",
       "subListenDesc": "The IP address for the subscription service. (leave blank to listen on all IPs)",
       "subPort": "Listen Port",