fix 方向

strategy/src/predictor.rs

@@ -425,7 +425,7 @@ impl Predictor {
                     }
 
                     // 向下跌，并且fair上穿mid，视为观测阶段开始
-                    if mid_rate < Decimal::ZERO && fair_rate > Decimal::ZERO && self.spread_diff > Decimal::ZERO {
+                    if mid_rate > Decimal::ZERO && fair_rate > Decimal::ZERO && self.spread_diff > Decimal::ZERO {
                         self.fair_rate_focus_open = mid_rate;
                         self.mid_price_focus_open = self.mid_price;
                     }