旧存档的假卡补上风扇数、供电口破绽

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

src/Decentralized.Domain/CardLook.cs

@@ -63,6 +63,19 @@ namespace Decentralized.Domain
         /// <summary>六位数字，存在物品标签上：风扇、金手指、挡板、丝印、封条、序列号。</summary>
         public string Encode() => $"{Fan}{Fingers}{Bracket}{Print}{Sticker}{Serial}{CountBad}{PinBad}";
 
+        /// <summary>
+        /// 旧版存档的外观只有 5 或 6 位（没有风扇数、供电口两位）：旧规则里假卡的风扇数和供电口只要档次不同就一定对不上。
+        /// 这里按旧规则补上，旧存档里的假卡仍然露出同样的破绽。新格式（8 位）不动。
+        /// </summary>
+        public static CardLook Legacy(string encoded, CardLook look, string label, string chip)
+        {
+            if (encoded == null || encoded.Length >= 8 || string.IsNullOrEmpty(chip) || chip == label) return look;
+            var l = Hardware.Specs[label]; var c = Hardware.Specs[chip];
+            look.CountBad = Hardware.FanCount[l.Tier] != Hardware.FanCount[c.Tier] ? 1 : 0;
+            look.PinBad = Hardware.PinClass[l.Tier] != Hardware.PinClass[c.Tier] ? 1 : 0;
+            return look;
+        }
+
         public static CardLook Decode(string s)
         {
             if (s == null || s.Length < 5 || s.Length > 8) return default;