feat(frontend): 尾盘父级菜单与图标优化

- 尾盘策略、尾盘监控归入「尾盘」父级菜单，与跟单交易结构一致
- 菜单图标：父级 LineChart，尾盘策略 RocketOutlined，尾盘监控 DashboardOutlined
- 多语言：新增 menu.cryptoTail（尾盘/尾盤/Crypto Tail）
- 含 CryptoTailMonitor 及后端 DTO/Service 等修改

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

backend/src/main/kotlin/com/wrbug/polymarketbot/dto/CryptoTailMonitorDto.kt

@@ -68,6 +68,8 @@ data class CryptoTailMonitorPushData(
     val timestamp: Long = System.currentTimeMillis(),
     /** 当前周期开始时间 (Unix 秒) */
     val periodStartUnix: Long = 0L,
+    /** 当前周期市场标题（周期切换时更新） */
+    val marketTitle: String = "",
     /** 当前价格 (Up方向，来自订单簿) */
     val currentPriceUp: String? = null,
     /** 当前价格 (Down方向，来自订单簿) */

backend/src/main/kotlin/com/wrbug/polymarketbot/service/cryptotail/CryptoTailMonitorService.kt

@@ -101,6 +101,9 @@ class CryptoTailMonitorService(
     private val lastPriceChangePushTime = ConcurrentHashMap<Long, Long>()
     private val priceChangePushThrottleMs = 1_000L
 
+    /** 当前周期/下一周期构建时缓存的市场标题，key = "strategyId-periodStartUnix"，供推送携带 */
+    private val marketTitleByStrategyPeriod = ConcurrentHashMap<String, String>()
+
     data class MonitorEntry(
         val strategyId: Long,
         val strategy: CryptoTailStrategy,
@@ -196,6 +199,7 @@ class CryptoTailMonitorService(
                 minPrice = strategy.minPrice.toPlainString(),
                 maxPrice = strategy.maxPrice.toPlainString(),
                 minSpreadMode = strategy.spreadMode.name,
+                spreadDirection = strategy.spreadDirection.name,
                 minSpreadValue = strategy.spreadValue?.toPlainString(),
                 autoMinSpreadUp = autoMinSpreadUp?.toPlainString(),
                 autoMinSpreadDown = autoMinSpreadDown?.toPlainString(),
@@ -409,6 +413,7 @@ class CryptoTailMonitorService(
             val strategyPeriod = (nowSeconds / strategy.intervalSeconds) * strategy.intervalSeconds
             val slug = "${strategy.marketSlugPrefix}-$strategyPeriod"
             val event = fetchEventBySlug(slug).getOrNull() ?: continue
+            marketTitleByStrategyPeriod["${strategy.id!!}-$strategyPeriod"] = event.title ?: strategy.marketSlugPrefix
             val market = event.markets?.firstOrNull() ?: continue
             val tokenIds = parseClobTokenIds(market.clobTokenIds)
             if (tokenIds.size < 2) continue
@@ -440,6 +445,7 @@ class CryptoTailMonitorService(
             if (event == null) {
                 continue
             }
+            marketTitleByStrategyPeriod["${strategy.id!!}-$nextPeriod"] = event.title ?: strategy.marketSlugPrefix
             val market = event.markets?.firstOrNull()
             if (market == null) {
                 continue
@@ -726,10 +732,13 @@ class CryptoTailMonitorService(
         val inPriceRangeDown = currentDown != null &&
                 currentDown >= strategy.minPrice && currentDown <= strategy.maxPrice
 
+        val marketTitle = marketTitleByStrategyPeriod["${strategy.id!!}-$periodStartUnix"] ?: strategy.marketSlugPrefix
+
         return CryptoTailMonitorPushData(
             strategyId = strategy.id!!,
             timestamp = System.currentTimeMillis(),
             periodStartUnix = periodStartUnix,
+            marketTitle = marketTitle,
             currentPriceUp = priceData.currentPriceUp?.setScale(4, RoundingMode.HALF_UP)?.toPlainString(),
             currentPriceDown = priceData.currentPriceDown?.setScale(4, RoundingMode.HALF_UP)?.toPlainString(),
             spreadUp = priceData.spreadUp?.setScale(4, RoundingMode.HALF_UP)?.toPlainString(),