Black market merchant shelves, bulk discount, bulk merchants, volume-driven taint, list-all

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

src/Decentralized.Domain/BlackMarket.cs

@@ -47,6 +47,12 @@ namespace Decentralized.Domain
             P("shotgun", 3), P("smg", 3), P("c4", 3), P("cmd_keycard", 3), P("crypto_module_sec", 3),
         };
 
+        /// <summary>药品池：只有药物商家卖，也能转手出售。</summary>
+        public static readonly KeyValuePair<string, int>[] PharmaPool =
+        {
+            P("unlicensed_phagimycin_pill", 2), P("dream_dust", 2), P("restricted_chemical", 2), P("fanta_pill", 3), P("nightmare_dust", 3),
+        };
+
         /// <summary>高科技物品池（不是违禁品，黑市上要加价）：矿机能用上的系统模组、能量电池、能量阵列，和矿架本身。</summary>
         public static readonly string[] TechPool =
         {