ui: black market buy page with seller list, payment panel, per-merchant accepted coins and auto-convert; wallet row keys beside the data cells

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

src/Decentralized.Domain/BmMerchants.cs

@@ -51,6 +51,27 @@ namespace Decentralized.Domain
             [MerchantType.Luxury] = new[] { C("pheromone_perfume", 2), G("neuroactive_perfume"), G("self_refilling_neuroactive_perfume"), G("skincare_cream"), G("packet_red_cigarette"), G("gamblers_coin"), G("kotton_fabric"), G("armor_lining") },
         };
 
+        /// <summary>
+        /// 各类商家收的币：硬件和技术类收 PSC，违禁类收 CRT 和匿名币，农业养殖水务收 PSC 和 CRA，个人卖家收 CRT 和匿名币。
+        /// 平台现货收 PSC、CRT、CRA。不在表里的币要先换：Web3 内置的自动换币要多付滑点（<see cref="Tuning.BmAutoSwapSlip"/>），也可以自己去 DEX 换。
+        /// </summary>
+        public static readonly string[] PlatformAccepts = { Assets.PSC, Assets.CRT, Assets.CRA };
+
+        public static string[] Accepts(MerchantType type)
+        {
+            switch (type)
+            {
+                case MerchantType.Rigs: case MerchantType.Modules: case MerchantType.Miner: case MerchantType.Tools: case MerchantType.Storage:
+                case MerchantType.GpuNew: case MerchantType.GpuUsed: case MerchantType.Asic: case MerchantType.Elite: case MerchantType.Bulk:
+                    return new[] { Assets.PSC, Assets.CRT };
+                case MerchantType.Arms: case MerchantType.GunMods: case MerchantType.Docs: case MerchantType.Pharma: case MerchantType.Chem:
+                case MerchantType.Luxury: case MerchantType.Personal:
+                    return new[] { Assets.CRT, Assets.Ponero };
+                default:   // Brewer、Farm、Husbandry、Water
+                    return new[] { Assets.PSC, Assets.CRA };
+            }
+        }
+
         private static readonly Dictionary<string, BmEntry> ById = BuildIndex();
 
         private static Dictionary<string, BmEntry> BuildIndex()

src/Decentralized.Domain/Tuning.cs

@@ -237,6 +237,9 @@ namespace Decentralized.Domain
         public const double FakeSupportChance = 0.04, FakeTransferShare = 0.08;
         public const int ScamMinDay = 10;
 
+        /// <summary>Web3 内置自动换币：商家不收手里的币时，按这个比例多付（DEX 手续费 0.3% 加上高滑点），省得自己去换。</summary>
+        public const double BmAutoSwapSlip = 0.08;
+
         /// <summary>剧情联动：塞尔皮科证据交给革命军（CRA 补贴池注资、螺旋概率倍率与期限、SPARK 几晚内涨到的倍数）、交给黑市（CRT 脱锚与被出卖的倍率）、
         /// 交给治安部（期限内出金审查命中、混币器制裁、操纵与内幕查处的倍率）；埃莉诺泄露数据盘（CRC 托管减记倍率、SPARK 涨幅）、交回（CRC 脱锚倍率）；
         /// 伦警官被捕（期限与查处倍率）；SPARK 推涨分几晚走完。</summary>