功能：补充固定场景助手与GPU健康诊断能力

platform/internal/server/observability.go

@@ -299,7 +299,7 @@ func (s *Server) observe(ctx context.Context) error {
 		}
 	}
 	// Bounded retention. Current incidents and active session records are preserved.
-	for _, query := range []string{"DELETE FROM login_limits WHERE window_started<now()-interval '1 day'", "DELETE FROM resource_samples WHERE sampled_at<now()-interval '30 days'", "DELETE FROM terminal_metric_samples WHERE sampled_at<now()-interval '30 days'", "DELETE FROM session_history WHERE ended_at<now()-interval '90 days'", "DELETE FROM alerts WHERE resolved_at<now()-interval '90 days'"} {
+	for _, query := range []string{"DELETE FROM login_limits WHERE window_started<now()-interval '1 day'", "DELETE FROM resource_samples WHERE sampled_at<now()-interval '30 days'", "DELETE FROM terminal_metric_samples WHERE sampled_at<now()-interval '30 days'", "DELETE FROM terminal_log_archives WHERE captured_at<now()-interval '30 days'", "DELETE FROM session_history WHERE ended_at<now()-interval '90 days'", "DELETE FROM alerts WHERE resolved_at<now()-interval '90 days'"} {
 		if _, err = tx.ExecContext(ctx, query); err != nil {
 			return err
 		}