Sort numeric labels by value

Records, zones and findings now order all-digit labels numerically, so
reverse zones list 2 before 101. model.CanonicalLess is replaced by
model.NameLess; other labels keep byte order.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/server/h_config.go

@@ -637,7 +637,7 @@ func (s *Server) search(w http.ResponseWriter, r *http.Request, p *auth.Principa
 	}
 	sort.Slice(recs, func(i, j int) bool {
 		if recs[i].Name != recs[j].Name {
-			return model.CanonicalLess(recs[i].Name, recs[j].Name)
+			return model.NameLess(recs[i].Name, recs[j].Name)
 		}
 		return recs[i].ID < recs[j].ID
 	})