feat(backtest): 结算显示市场名称，列表非终态任务 3s 轮询进度

- 结算记录: WIN/LOSE/UNKNOWN/CLOSED 通过 marketService.getMarket 写入 marketTitle
- 回测列表: 存在 PENDING/RUNNING 时每 3 秒静默刷新列表更新进度，全部终态后停止轮询

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/src/main/kotlin/com/wrbug/polymarketbot/service/backtest/BacktestExecutionService.kt

@@ -554,11 +554,12 @@ class BacktestExecutionService(
 
                 balance += settlementValue
 
+                val marketTitle = marketService.getMarket(position.marketId)?.title ?: ""
                 val settlementTrade = BacktestTrade(
                     backtestTaskId = task.id!!,
                     tradeTime = currentTime,
                     marketId = position.marketId,
-                    marketTitle = "",
+                    marketTitle = marketTitle,
                     side = "SETTLEMENT",
                     outcome = when {
                         settlementPrice == BigDecimal.ONE -> "WIN"
@@ -611,11 +612,12 @@ class BacktestExecutionService(
 
             balance += settlementValue
 
+            val marketTitle = marketService.getMarket(position.marketId)?.title ?: ""
             val closedTrade = BacktestTrade(
                 backtestTaskId = task.id!!,
                 tradeTime = currentTime,
                 marketId = position.marketId,
-                marketTitle = "",
+                marketTitle = marketTitle,
                 side = "SETTLEMENT",
                 outcome = "CLOSED",
                 outcomeIndex = position.outcomeIndex,