Exclude skip status domains from default API listing

When no status filter is provided, the domains API now excludes
domains with 'skip' status (including bare TLDs) by default.

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

api_domains.go

@@ -78,6 +78,7 @@ func (c *Crawler) handleAPIDomains(w http.ResponseWriter, r *http.Request) {
 				LIMIT $2 OFFSET $3
 			`, status, limit, offset)
 		} else {
+			// Default: exclude 'skip' status domains
 			rows, err = c.db.Query(`
 				SELECT d.host, d.tld, d.status, d.last_error, f.feed_count
 				FROM domains d
@@ -86,6 +87,7 @@ func (c *Crawler) handleAPIDomains(w http.ResponseWriter, r *http.Request) {
 					FROM feeds
 					GROUP BY source_host
 				) f ON d.host = f.source_host
+				WHERE d.status != 'skip'
 				ORDER BY d.tld ASC, d.host ASC
 				LIMIT $1 OFFSET $2
 			`, limit, offset)
@@ -104,6 +106,7 @@ func (c *Crawler) handleAPIDomains(w http.ResponseWriter, r *http.Request) {
 			LIMIT $2 OFFSET $3
 		`, status, limit, offset)
 	} else {
+		// Default: exclude 'skip' status domains
 		rows, err = c.db.Query(`
 			SELECT d.host, d.tld, d.status, d.last_error, COALESCE(f.feed_count, 0) as feed_count
 			FROM domains d
@@ -112,6 +115,7 @@ func (c *Crawler) handleAPIDomains(w http.ResponseWriter, r *http.Request) {
 				FROM feeds
 				GROUP BY source_host
 			) f ON d.host = f.source_host
+			WHERE d.status != 'skip'
 			ORDER BY d.tld ASC, d.host ASC
 			LIMIT $1 OFFSET $2
 		`, limit, offset)