feat(crypto-tail): 尾盘策略完整实现与优化

- 尾盘策略 CRUD、订单簿 WS 订阅、周期内触发下单
- 订单簿订阅日志增加市场 slug，便于排查
- 移除轮询，完全依赖 WebSocket（删除 CryptoTailStrategyScheduler）
- FIXED 模式数量改为小数、向上取整，与签名服务一致
- 前端策略列表页、多语言与 API 对接

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

frontend/src/types/index.ts

@@ -1034,3 +1034,53 @@ export interface BacktestTaskDto {
   executionStartedAt?: number
   executionFinishedAt?: number
 }
+
+/**
+ * 尾盘策略
+ */
+export interface CryptoTailStrategyDto {
+  id: number
+  accountId: number
+  name?: string
+  marketSlugPrefix: string
+  marketTitle?: string
+  intervalSeconds: number
+  windowStartSeconds: number
+  windowEndSeconds: number
+  minPrice: string
+  maxPrice: string
+  amountMode: string
+  amountValue: string
+  enabled: boolean
+  lastTriggerAt?: number
+  createdAt: number
+  updatedAt: number
+}
+
+/**
+ * 尾盘策略触发记录
+ */
+export interface CryptoTailStrategyTriggerDto {
+  id: number
+  strategyId: number
+  periodStartUnix: number
+  marketTitle?: string
+  outcomeIndex: number
+  triggerPrice: string
+  amountUsdc: string
+  orderId?: string
+  status: string
+  failReason?: string
+  createdAt: number
+}
+
+/**
+ * 尾盘策略市场选项
+ */
+export interface CryptoTailMarketOptionDto {
+  slug: string
+  title: string
+  intervalSeconds: number
+  periodStartUnix: number
+  endDate?: string
+}