feat(crypto-tail): 尾盘策略收益与胜率：轮询未结算订单并回写收益

- 新增 V35 迁移：trigger 表增加 condition_id/resolved/winner_outcome_index/realized_pnl/settled_at
- 新增 CryptoTailSettlementService：每 10s 轮询 success 未结算订单，Gamma+链上查结算，优先用 CLOB 订单实际成交价与成交量算收益
- 防重叠：与订单轮询一致使用 Job+CoroutineScope，上一轮未结束则跳过
- 策略/触发 DTO 暴露 totalRealizedPnl、胜率及单笔 resolved/realizedPnl

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

backend/src/main/resources/db/migration/V35__add_crypto_tail_trigger_settlement_fields.sql

@@ -0,0 +1,13 @@
+-- ============================================
+-- V35: 尾盘策略触发记录 - 结算与收益字段
+-- 用于轮询服务：扫描 success 但未结算的订单，查链上结算结果并回写收益
+-- ============================================
+
+ALTER TABLE crypto_tail_strategy_trigger
+    ADD COLUMN condition_id VARCHAR(66) DEFAULT NULL COMMENT '市场 conditionId（用于查链上结算）' AFTER order_id,
+    ADD COLUMN resolved TINYINT(1) NOT NULL DEFAULT 0 COMMENT '是否已结算: 0=未结算, 1=已结算',
+    ADD COLUMN winner_outcome_index INT DEFAULT NULL COMMENT '市场赢家 outcome 索引（结算后写入）',
+    ADD COLUMN realized_pnl DECIMAL(20, 8) DEFAULT NULL COMMENT '已实现盈亏 USDC（赢为正，输为负）',
+    ADD COLUMN settled_at BIGINT DEFAULT NULL COMMENT '结算时间（毫秒时间戳）';
+
+CREATE INDEX idx_trigger_settlement ON crypto_tail_strategy_trigger (status, resolved);