internal/checker+gui: remove voice-srv test (Discord doesn't expose regional voice servers via public DNS)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

internal/checker/hints_test.go

@@ -18,7 +18,7 @@ func TestHintFor(t *testing.T) {
 	t.Run("context_canceled_uniform", func(t *testing.T) {
 		// Cancellation is always reported as «Проверка отменена.» across
 		// all testIDs.
-		for _, id := range []string{"tcp", "greet", "auth", "connect", "udp", "voice-quality", "voice-srv", "api", "unknown"} {
+		for _, id := range []string{"tcp", "greet", "auth", "connect", "udp", "voice-quality", "api", "unknown"} {
 			assert.Equal(t, "Проверка отменена.", hintFor(id, context.Canceled), "id=%s", id)
 			assert.Equal(t, "Проверка отменена.", hintFor(id, context.DeadlineExceeded), "id=%s", id)
 		}
@@ -121,10 +121,6 @@ func TestHintFor_PerStepBranches(t *testing.T) {
 		{"voice_quality_unsupported_family", "voice-quality", ErrSTUNUnsupportedFamily, "мусор"},
 		{"voice_quality_fallback", "voice-quality", errors.New("weird"), "качество"},
 
-		// voice-srv: DNS error, timeout, generic
-		{"voice_srv_timeout", "voice-srv", &timeoutOnlyError{}, "таймаут"},
-		{"voice_srv_generic", "voice-srv", errors.New("boom"), "boom"},
-
 		// api: timeout vs generic
 		{"api_timeout", "api", &timeoutOnlyError{}, "таймаут"},
 		{"api_generic", "api", errors.New("tls boom"), "TLS"},
@@ -158,7 +154,6 @@ func TestTcpFriendlyName(t *testing.T) {
 		"connect":       "TCP-туннель к Discord",
 		"udp":           "UDP ASSOCIATE",
 		"voice-quality": "качество UDP-канала",
-		"voice-srv":     "доступность voice-серверов Discord",
 		"api":           "Discord API",
 		"weirdo":        "weirdo",
 	}