Fold scattered constants into Tuning

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/Decentralized.Domain/UsedDealer.cs

@@ -18,15 +18,15 @@ namespace Decentralized.Domain
 
     public static class UsedDealers
     {
-        public const double MiddlemanMarkup = 0.08;
-        public const double FakeShareMiddleman = 0.10, FakeShareScammer = 0.45;
+        public const double MiddlemanMarkup = Tuning.UsedMiddlemanMarkup;
+        public const double FakeShareMiddleman = Tuning.UsedFakeMiddleman, FakeShareScammer = Tuning.UsedFakeScammer;
 
         /// <summary>今天来的贩子的类型：骗子越往后越多。</summary>
         public static DealerKind Kind(int day, Rng rng)
         {
-            double scam = Math.Min(0.30, 0.10 + day * 0.004);
+            double scam = Math.Min(Tuning.UsedScamMax, Tuning.UsedScamBase + day * Tuning.UsedScamPerDay);
             double r = rng.NextDouble();
-            return r < scam ? DealerKind.Scammer : r < scam + 0.30 ? DealerKind.Middleman : DealerKind.Honest;
+            return r < scam ? DealerKind.Scammer : r < scam + Tuning.UsedMiddlemanShare ? DealerKind.Middleman : DealerKind.Honest;
         }
 
         /// <summary>能出现在二手市场上的型号：按天数放开，旗舰第 30 天起。</summary>