fix(crypto-tail): 周期切换时按周期拉取 tokenIds，修复手动下单 orderbook 不存在

- 后端 initMonitor 支持可选 periodStartUnix，按指定周期取市场与 tokenIds
- 前端周期切换时调用 monitorInit 传入 pushPeriod，确保 tokenIds 与当前周期一致
- 修复切换周期无变化及手动下单报 orderbook does not exist

Made-with: Cursor

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

@@ -5,7 +5,9 @@ package com.wrbug.polymarketbot.dto
  */
 data class CryptoTailMonitorInitRequest(
     /** 策略ID */
-    val strategyId: Long = 0L
+    val strategyId: Long = 0L,
+    /** 指定周期开始时间 (Unix 秒)，不传则用服务器当前周期 */
+    val periodStartUnix: Long? = null
 )
 
 /**

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

@@ -147,7 +147,8 @@ class CryptoTailMonitorService(
 
             val account = accountRepository.findById(strategy.accountId).orElse(null)
             val nowSeconds = System.currentTimeMillis() / 1000
-            val periodStartUnix = (nowSeconds / strategy.intervalSeconds) * strategy.intervalSeconds
+            val periodStartUnix = request.periodStartUnix
+                ?: ((nowSeconds / strategy.intervalSeconds) * strategy.intervalSeconds)
 
             // 获取市场信息
             val slug = "${strategy.marketSlugPrefix}-$periodStartUnix"