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/sub/sub_panic_test.go

@@ -99,7 +99,7 @@ func TestGetClashEmitsPinnedCertSha256(t *testing.T) {
 	stream := `{"network":"tcp","security":"tls","tlsSettings":{"serverName":"pin.sni","settings":{"pinnedPeerCertSha256":["` + pin + `"]}}}`
 	seedSubInbound(t, "pin1", "pin", 46300, 1, stream)
 
-	out, _, err := NewSubClashService(false, "", NewSubService("")).GetClash("pin1", "sub.example.com")
+	out, _, err := NewSubClashService(false, "", false, NewSubService("")).GetClash("pin1", "sub.example.com")
 	if err != nil {
 		t.Fatalf("GetClash: %v", err)
 	}
@@ -122,7 +122,7 @@ func TestJsonAndClashTolerateExternalProxyMissingPort(t *testing.T) {
 		t.Fatal("GetJson returned empty for an externalProxy entry missing port")
 	}
 
-	clashOut, _, err := NewSubClashService(false, "", NewSubService("")).GetClash("extp1", "sub.example.com")
+	clashOut, _, err := NewSubClashService(false, "", false, NewSubService("")).GetClash("extp1", "sub.example.com")
 	if err != nil {
 		t.Fatalf("GetClash: %v", err)
 	}