Phase 1 cleanup: stale unlock text, unused code, README layout

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

src/Decentralized.Domain/CardLook.cs

@@ -111,8 +111,5 @@ namespace Decentralized.Domain
 
         /// <summary>真实价值：全部标签都按真实情况算。</summary>
         public static long True(Unit u) => CardLabels.Value(u, null, 0);
-
-        /// <summary>标称价：贩子报的价，按标称型号算；二手卡也折旧，但只按贩子"自称"的健康度。</summary>
-        public static long Quoted(Unit u, double claimedHealth) => Of(u.Model, claimedHealth);
     }
 }