Query log wording: N answers so far, each kept for 7 days

"The query log holds 7 answers (stats.retention.queries)" read like 7 days' worth. The dashboard and the Statistics page now say how many answers it holds and how long each is kept; the dashboard's storage info has query_log_retention.

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

internal/server/h_storage.go

@@ -41,6 +41,7 @@ func (s *Server) storage(ctx context.Context) *api.Storage {
 			if d := dbFile(statsDB, p); d != nil && s.cfg.Stats.Options().RetainQueries > 0 {
 				if n, err := s.cfg.Stats.Store().QueryLogSize(ctx); err == nil {
 					d.QueryLogRows = &n
+					d.QueryLogRetention = s.cfg.Stats.Status().Retention.Queries
 				}
 			}
 			add(statsDB, filepath.Dir(p))