Buyer spots each hidden flaw with 50% chance

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

src/Decentralized/Items.cs

@@ -123,7 +123,7 @@ namespace Decentralized
 
         private static object checkedClient;
         private static readonly HashSet<int> checkedItems = new HashSet<int>();
-        public const double CustomerSpotChance = 0.35;
+        public const double CustomerSpotChance = 0.50;
         public const int RepLossMax = 25;
 
         /// <summary>被顾客看穿时的信誉损失：骗的价差每满一周房租扣 1 点，最少 1，最多 25。</summary>