Skip bare TLDs during domain import

Domains without a dot (e.g., "com", "net", "org") are bare TLDs
from Common Crawl data and should not be processed as domains.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

domain.go

@@ -33,6 +33,10 @@ func shouldAutoSkipDomain(host string) bool {
 	if strings.HasSuffix(host, "1440.news") || host == "1440.news" {
 		return false
 	}
+	// Skip bare TLDs (no dot means it's just "com", "net", etc.)
+	if !strings.Contains(host, ".") {
+		return true
+	}
 	// Skip domains starting with a digit (spam pattern)
 	if len(host) > 0 && host[0] >= '0' && host[0] <= '9' {
 		return true