Phase 2: customers paying in coin (CRC/CRT/CRA/PSC), taint from stolen goods

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

src/Decentralized/CoinCustomers.cs

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+using System.Collections.Generic;
+using Decentralized.Domain;
+
+namespace Decentralized
+{
+    /// <summary>
+    /// 用币付款的顾客：每天排队的买家里，按派系（上层 CRC、黑市 CRT、革命派 CRA、下层 PSC）有一小部分改用币结算。
+    /// 成交时在店里扣回刚入账的信用点，换成币进热钱包；赃物的款项不记销赃，改成币带污点（货值 × 赃物热度%）。
+    /// </summary>
+    public static class CoinCustomers
+    {
+        private static readonly HashSet<StoreClient> Marked = new HashSet<StoreClient>();
+        private static int markDay = -1;
+
+        public static void Subscribe()
+        {
+            ModHook.OnGenerateCustomerLate += OnGenerate;
+            ModHelper.AddDebugFunction(ModInfo.Id, ModInfo.Name, "Coin buyer (test)", () => Log.Guard("用币付款顾客（测试）", () =>
+            {
+                var c = new StoreClient
+                {
+                    identifier = "pd_coin_test", displayName = "Coin buyer", spriteName = SpriteDict.GetRandomScavSpriteName(),
+                    clientFaction = "FACTION_BLACK_MARKET", useClientBudget = true, clientIntent = StoreClient.ClientIntent.BUY,
+                    canClientExposeFeature = ClientCanExposeFunc.BasicClientExposeCapacity,
+                };
+                c.SetBudget(5000);
+                c.clientBuyingTagList.Add("WATER"); c.clientBuyingTagList.Add("BREVAGE");
+                c.mainDialogue.SetText(c.displayName, "CRT.").SetEndAction(() => { });
+                c.AddBasicDialog();
+                c.CompleteClientCreation();
+                Mark(c, Assets.CRT);
+                PlayerStore.Instance.currentClientInstance = StoreClientInstance.CreateClientInstance(c);   // 测试：直接换成这位顾客
+            }));
+        }
+        public static void Unsubscribe() => ModHook.OnGenerateCustomerLate -= OnGenerate;
+
+        private static void OnGenerate(StoreClientManager manager)
+        {
+            if (Session.Data == null || !Unlock.IsUnlocked) return;
+            Log.Guard("用币付款", () =>
+            {
+                int day = StoreStation.GetDayCounter();
+                if (day != markDay) { Marked.Clear(); markDay = day; }
+                foreach (var c in manager.clientStack)
+                {
+                    if (c == null || c.isSecurity || Marked.Contains(c) || c.clientIntent != StoreClient.ClientIntent.BUY || c.isNoContributeToEvidence) continue;
+                    Marked.Add(c);
+                    string asset = CoinPayment.AssetFor(c.clientFaction);
+                    if (asset == null || !Session.Data.Rng.Chance(CoinPayment.Chance(asset))) continue;
+                    Mark(c, asset);
+                }
+            });
+        }
+
+        private static void Mark(StoreClient c, string asset)
+        {
+            var before = c.onItemBought;
+            c.isNoContributeToEvidence = true;
+            c.onItemBought = (item, cost) =>
+            {
+                before?.Invoke(item, cost);
+                Log.Guard("用币付款成交", () => Pay(asset, item, cost));
+            };
+        }
+
+        private static void Pay(string asset, GameItem item, int cost)
+        {
+            var d = Session.Data;
+            double price = Session.Price(asset);
+            if (cost <= 0 || price <= 0) return;
+            int heat = item.IsTag("STOLEN_VALUE_INT") ? item.GetTagReadonly("STOLEN_VALUE_INT").GetInt() : 0;
+            ModHelper.AddCredit(-cost, false);
+            double qty = CoinPayment.Receive(d.Hot, asset, cost, price, heat);
+            d.CoinSalesToday += cost;
+            Log.Info($"用币付款：{item.name} {cost} 信用点 → {qty:0.####} {asset}，污点 +{cost * heat / 100.0:0}");
+        }
+    }
+}