fin: increase SideArbRate from 0.5 to 0.75 to accelerate secondary pool convergence and mitigate AMM lag arbitrage

src/Decentralized.Domain/Tuning.cs

@@ -87,7 +87,7 @@ namespace Decentralized.Domain
         /// <summary>显卡价值 = 型号定价 ×（下限 + (1 − 下限) × 健康度）。</summary>
         public const double CardValueFloor = 0.25;
         /// <summary>非主交易对每晚被拉回参考价的比例，及其深度占主交易对的比例。</summary>
-        public const double SideArbRate = 0.5, SideDepthShare = 0.3;
+        public const double SideArbRate = 0.75, SideDepthShare = 0.3;
         /// <summary>Web3 黑市：开放所需黑市声望，中 / 高档货所需声望，现货每周刷新的天数与基础件数（每高 BmStockPerRep 声望多一件），现货溢价。</summary>
         public const int BmOpenRep = 10, BmMidRep = 40, BmHighRep = 80, BmRefreshDays = 7, BmStockBase = 4;
         public const double BmStockPerRep = 40, BmPremium = 0.30;