fix: 旧格式行回撤/均持仓显示空——回撤列加portfolio_full兜底+回填avg_hold_days

static/index.html

@@ -2117,7 +2117,7 @@ function renderStrategyTable(strategies) {
       cell('avg_profit_pct', st.avg_profit_pct, v => v + '%', (st.avg_profit_pct || 0) >= 0 ? 'text-green-400' : 'text-red-400') +
       cell('sharpe_ratio', st.sharpe_ratio, v => v, hl(st.sharpe_ratio, best.sharpe_ratio)) +
       cell('profit_factor', st.profit_factor, v => v, hl(st.profit_factor, best.profit_factor)) +
-      cell('portfolio_max_dd_pct', pf.portfolio_max_dd_pct, v => v + '%', hl(pf.portfolio_max_dd_pct, best.portfolio_max_dd_pct, true), true) +
+      cell('portfolio_max_dd_pct', (st.portfolio_full||pf).portfolio_max_dd_pct, v => v + '%', hl((st.portfolio_full||pf).portfolio_max_dd_pct, best.portfolio_max_dd_pct, true), true) +
       '<td class="text-center px-2 py-1.5" onclick="event.stopPropagation()">' +
         '<button onclick="runStrategyBacktest(\'' + s.version + '\')" class="px-2 py-0.5 bg-blue-600/60 hover:bg-blue-500 rounded text-xs">▶回测</button>' +
       '</td></tr>';