Fix TLD sync to use domain_tld column for feeds table

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

tld.go

@@ -98,7 +98,7 @@ func (c *Crawler) syncTLDs() error {
 		for _, tld := range unofficialTLDs {
 			result, err := c.db.Exec(`
 				UPDATE feeds SET status = 'dead'
-				WHERE tld = $1 AND status != 'dead'
+				WHERE domain_tld = $1::tld_enum AND status != 'dead'
 			`, tld)
 			if err != nil {
 				fmt.Printf("TLD sync: error marking feeds for TLD %s: %v\n", tld, err)