Stage 9.1: story links (Serpico, Eleanor, Officer Lun) and newspaper importance fix

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

src/Decentralized.Domain/StoryMods.cs

@@ -0,0 +1,88 @@
+using System;
+using System.Collections.Generic;
+
+namespace Decentralized.Domain
+{
+    /// <summary>
+    /// 游戏剧情选择对本 mod 世界的影响：一组倍率和期限，随存档保存。各处的概率读 <see cref="Current"/>（接入层读档时指向存档里的这一份）。
+    /// 每个选择只生效一次（Applied 记下键）。
+    /// </summary>
+    public sealed class StoryMods
+    {
+        /// <summary>当前生效的那一份。接入层读档时设成存档里的；测试里可以换。</summary>
+        public static StoryMods Current = new StoryMods();
+
+        public List<string> Applied = new List<string>();
+        /// <summary>CRC 脱锚、CRC 托管银行减记、CRT 脱锚、镇压时 CRT 被出卖的概率倍率（永久）。</summary>
+        public double CrcDepeg = 1, CrcHaircut = 1, CrtDepeg = 1, CrtFreeze = 1;
+        /// <summary>到这一天之前 CRA 螺旋概率减半。</summary>
+        public int CraSafeUntil = -1;
+        /// <summary>治安部整顿到这一天：出金审查命中率、混币器制裁概率、操纵与内幕查处概率上调。</summary>
+        public int SecUntil = -1;
+        /// <summary>伦警官被捕后的立威期到这一天：出金审查、操纵、内幕查处概率上调。</summary>
+        public int LunUntil = -1;
+        /// <summary>SPARK 每晚额外乘的倍数，还剩几晚。</summary>
+        public double SparkPush = 1;
+        public int SparkPushNights;
+
+        public bool Has(string key) => Applied.Contains(key);
+
+        public double CraSpiral(int day) => day < CraSafeUntil ? Tuning.StoryCraSpiralMult : 1;
+        public double Aml(int day) => (day < SecUntil ? Tuning.StorySecAmlMult : 1) * (day < LunUntil ? Tuning.StoryLunMult : 1);
+        public double Sanction(int day) => day < SecUntil ? Tuning.StorySecSanctionMult : 1;
+        /// <summary>操纵检出、内幕查处的概率倍率。</summary>
+        public double Enforce(int day) => (day < SecUntil ? Tuning.StorySecEnforceMult : 1) * (day < LunUntil ? Tuning.StoryLunMult : 1);
+
+        /// <summary>每晚取 SPARK 的额外倍数（推完就是 1）。</summary>
+        public double TakeSparkPush()
+        {
+            if (SparkPushNights <= 0) return 1;
+            SparkPushNights--;
+            return SparkPush;
+        }
+
+        /// <summary>
+        /// 记下一个剧情选择并设置倍率。返回 false 表示已经生效过。CRA 补贴池的注资由接入层做（这里只管倍率）。
+        /// key：serpico_rev / serpico_bm / serpico_sec / eleanor_leak / eleanor_return / lun_arrested。
+        /// </summary>
+        public bool Apply(string key, int day)
+        {
+            if (Has(key)) return false;
+            Applied.Add(key);
+            switch (key)
+            {
+                case "serpico_rev":
+                    CraSafeUntil = day + Tuning.StorySecDays;
+                    PushSpark(Tuning.StorySerpicoSpark);
+                    break;
+                case "serpico_bm":
+                    CrtDepeg *= Tuning.StoryBmCrtMult; CrtFreeze *= Tuning.StoryBmCrtMult;
+                    break;
+                case "serpico_sec":
+                    SecUntil = day + Tuning.StorySecDays;
+                    break;
+                case "eleanor_leak":
+                    CrcHaircut *= Tuning.StoryLeakHaircutMult;
+                    PushSpark(Tuning.StoryLeakSpark);
+                    break;
+                case "eleanor_return":
+                    CrcDepeg *= Tuning.StoryReturnCrcMult;
+                    break;
+                case "lun_arrested":
+                    LunUntil = day + Tuning.StoryLunDays;
+                    break;
+            }
+            return true;
+        }
+
+        /// <summary>SPARK 在接下来几晚里一共涨到 total 倍（每晚乘相同的倍数）。</summary>
+        private void PushSpark(double total)
+        {
+            int n = Tuning.StorySparkNights;
+            // 已经在推：把剩下的叠上去
+            double left = SparkPushNights > 0 ? Math.Pow(SparkPush, SparkPushNights) : 1;
+            SparkPush = Math.Pow(left * total, 1.0 / n);
+            SparkPushNights = n;
+        }
+    }
+}