Candles and volume for every traded asset, chart asset switcher

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

src/Decentralized.Domain/Tuning.cs

@@ -235,6 +235,9 @@ namespace Decentralized.Domain
         public const double FakeSupportChance = 0.04, FakeTransferShare = 0.08;
         public const int ScamMinDay = 10;
 
+        /// <summary>行情图的 NPC 成交量：每天的基础量占主池深度的比例（按币种），价格波动越大成交越多（|涨跌幅| × 倍数），再乘 0.6–1.4 的随机。</summary>
+        public const double ChartVolPsc = 0.12, ChartVolCrc = 0.10, ChartVolCrt = 0.06, ChartVolCra = 0.04, ChartVolSpark = 0.03, ChartVolPonero = 0.01, ChartVolMove = 8;
+
         /// <summary>主交易对（信用点一侧）的深度随天数增长。</summary>
         public static double PoolDepth(int day) => PoolDepth0 * (1 + day / 60.0);
     }