Cards: appearance follows wear, hash depends on fan and contacts, seller confrontation

Fan, contact and scratch levels are recomputed from health and a per-card
seed, so a card looks older as it wears. Fan and contacts scale hashrate.
Each inspection-tray detail now maps to exactly one dimension value. Quoting
dealers price the card as if its condition were fine; the player points out
fan, contacts, bracket, print or sticker in the tray to take the matching
discount or expose a fake (a wrong accusation costs reputation like the
vanilla confrontation). Unowned cards show a coarse grade and rated specs.

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

src/Decentralized.Domain/UsedDealer.cs

@@ -7,18 +7,20 @@ namespace Decentralized.Domain
     /// <summary>二手显卡贩子的类型：老实人按真实价卖；中间商加价；骗子夹带假卡，按标称型号的价卖。</summary>
     public enum DealerKind { Honest, Middleman, Scammer }
 
-    /// <summary>贩子带来的一张卡：<see cref="MarkupPct"/> 是柜台上相对真实价值的加价百分比（骗子卖假卡时是正的，按标称型号报价再打九折）。</summary>
+    /// <summary>贩子带来的一张卡。老实人不报价（按真实价值卖）；其他贩子 <see cref="Quoted"/> 为真，按 <see cref="CardValue.Quote"/> 报价，
+    /// <see cref="MarkupPct"/> 是加价百分比，玩家指出外观问题或假货迹象就按维度扣回去。</summary>
     public sealed class UsedCard
     {
         public string Model;
         public string FakeOf;
         public double Health;
         public int MarkupPct;
+        public bool Quoted;
     }
 
     public static class UsedDealers
     {
-        public const double MiddlemanMarkup = 0.08, ScamDiscount = 0.90;
+        public const double MiddlemanMarkup = 0.08, ScamDiscount = CardValue.ScamDiscount;
         public const double FakeShareMiddleman = 0.10, FakeShareScammer = 0.45;
 
         /// <summary>今天来的贩子的类型：骗子越往后越多。</summary>
@@ -49,13 +51,9 @@ namespace Decentralized.Domain
                 var label = pool[rng.Range(0, pool.Length - 1)];
                 var card = new UsedCard { Model = label, Health = 25 + rng.NextDouble() * 60 };
                 var cheaper = Hardware.Specs.Values.Where(s => !s.Asic && s.Price * 2 <= Hardware.Specs[label].Price).Select(s => s.Model).ToArray();
-                if (cheaper.Length > 0 && rng.Chance(share))
-                {
-                    card.FakeOf = cheaper[rng.Range(0, cheaper.Length - 1)];
-                    var u = new Unit { Model = card.Model, FakeOf = card.FakeOf, Health = card.Health };
-                    card.MarkupPct = (int)Math.Round((CardValue.Of(label, card.Health) * ScamDiscount / CardValue.True(u) - 1) * 100);
-                }
-                else if (kind == DealerKind.Middleman) card.MarkupPct = (int)Math.Round(MiddlemanMarkup * 100);
+                if (cheaper.Length > 0 && rng.Chance(share)) card.FakeOf = cheaper[rng.Range(0, cheaper.Length - 1)];
+                card.Quoted = kind != DealerKind.Honest;
+                card.MarkupPct = kind == DealerKind.Middleman ? (int)Math.Round(MiddlemanMarkup * 100) : 0;
                 cards.Add(card);
             }
             return cards;