docs: explain JEV System One entry filter

Author: tianhe

docs/trading/LIVE_TRADING_SAFETY.md

@@ -35,6 +35,10 @@ HTX equity products are rejected until authoritative metadata and an execution c
 - WebSocket improves latency; REST reconciliation remains the recovery source after disconnects.
 - A strategy manages only its allocated position and must not absorb manual or other-strategy inventory.
 
+## Optional JEV System One entry filter
+
+JEV is a System One model: it evaluates prepared state and typed questions into structured decisions instead of generating free-form text. Regular strategies and Quick Trade can use it before submitting entry orders. The result is reduced to an auditable `PASS` or `REJECT`; exits, stop loss, take profit, and emergency risk reduction bypass the filter. If JEV is unavailable, QuantDinger falls back to the configured LLM. If neither provider is available, the order proceeds and the unavailable provider is recorded so AI failure does not disable trading.
+
 ## Incident response
 
 1. Stop new entries and additions.

docs/trading/LIVE_TRADING_SAFETY_CN.md

@@ -35,6 +35,10 @@ HTX 股票类产品在权威产品元数据和执行契约验证前拒绝。混
 - WebSocket 用于低延迟，REST 对账仍是断线后的恢复来源。
 - 策略只能管理分配给自己的仓位，不能用它吸收手工或其他策略的仓位。
 
+## 可选的 JEV System One 开仓过滤
+
+JEV 是一种 System One 模型：它针对整理好的状态与类型化问题输出结构化判断，而不是生成自由文本。普通策略和闪电交易可在提交交易所前用它审核开仓订单，结果统一收敛为可审计的 `PASS` 或 `REJECT`；平仓、止损、止盈和紧急减仓会绕过过滤。JEV 不可用时系统降级到已配置的 LLM；两者均不可用时订单正常放行并记录服务不可用，避免 AI 故障中断交易。
+
 ## 异常处置
 
 1. 停止新的开仓和加仓。