Tiers drive physical traits and serial checks; guide item

Fans (1/2/3/3) and power connectors (6/8/8/8+8) follow the real chip's tier,
so a fake shows its real tier physically. Serial numbers (brand prefix, tier
code, factory code, four digits) are drawn on the sticker from card state;
the label bar gets power-and-fans and serial rows, eight in total, with a
framed panel. A graphics card appraisal guide item holds the rules.

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

src/Decentralized/Items.cs

@@ -15,6 +15,7 @@ namespace Decentralized
     {
         public const string Terminal = "pd_terminal";
         public const string Rig = "pd_rig";
+        public const string Guide = "pd_gpu_guide";
         public const string GpuPrefix = "pd_gpu_";
 
         public const string HealthTag = "PD_HEALTH";
@@ -36,6 +37,7 @@ namespace Decentralized
         {
             dir.Add(Terminal, CreateTerminal);
             dir.Add(Rig, CreateRig);
+            dir.Add(Guide, CreateGuide);
             foreach (var spec in Hardware.Specs.Values.Where(s => !s.Asic))
             {
                 var s = spec;
@@ -61,6 +63,20 @@ namespace Decentralized
             return item;
         }
 
+        /// <summary>显卡鉴定手册：档次对照、序列号规则、外观折扣。和游戏里的鉴定手册一样，是一件物品，说明里就是内容。</summary>
+        private static GameItem CreateGuide()
+        {
+            var item = ItemDirectory.CreateEmptyItem(Guide);
+            item.SetSpriteAndShapeFromMod(ModInfo.Id, "gpu_guide");
+            item.name = L.T("item.guide.name");
+            item.shortDescription = L.T("item.guide.desc");
+            item.unitValue = 0;
+            item.EnableTag(GeneralHelper.IMPORTANT_TAG);
+            item.EnableTag(TypeHelper.NOT_FOR_RESALE);
+            ModHelper.SetSource(item, ModInfo.Id, ModInfo.Name);
+            return item;
+        }
+
         // ---------- 显卡 ----------
 
         /// <summary>RZX70 → "RZX 70"，RZ800 → "RZ 800"。</summary>
@@ -129,7 +145,7 @@ namespace Decentralized
                 if ((lies & r) != 0 && rng.Chance(CustomerSpotChance))
                 {
                     found |= r;
-                    if (r != CardLabels.RowSpec && CardLabels.IsFakeSign(r, Claim.Truth(u).Get(r))) found |= CardLabels.RowSpec;
+                    if (r != CardLabels.RowSpec && CardLabels.IsEvidence(r, claim.Value, Claim.Truth(u))) found |= CardLabels.RowSpec | CardLabels.RowBuild;
                 }
             if (found == 0) return;
             item.ModifyTag(ExposedTag, t => t.Enable().SetInt(exposed | found));
@@ -217,7 +233,7 @@ namespace Decentralized
         public static Unit ToUnit(GameItem item)
         {
             string model = item.identifier.Substring(GpuPrefix.Length);
-            model = Hardware.Specs.Keys.First(k => k.ToLowerInvariant() == model);
+            model = Hardware.Specs.Keys.FirstOrDefault(k => k.ToLowerInvariant() == model) ?? "RZX60";   // 旧版本存档里的型号已改名，当作低端卡
             var u = new Unit { Model = model, Health = 100 };
             if (item.IsTag(HealthTag)) u.Health = item.GetTagReadonly(HealthTag).GetDouble();
             if (item.IsTag(FakeTag)) u.FakeOf = item.GetTagReadonly(FakeTag).GetString();
@@ -253,7 +269,7 @@ namespace Decentralized
                 item.SetSpriteAndShapeFromMod(ModInfo.Id, item.IsTag(BackTag) ? "gpu_burnt_b" : "gpu_burnt_f");
                 return;
             }
-            item.SetSpriteAndShapeFromMod(ModInfo.Id, (label.Brand == Hardware.Probidia ? "gpu_probidia" : "gpu_pmd") + (item.IsTag(BackTag) ? "_b" : "_f"));
+            item.SetSpriteAndShapeFromMod(ModInfo.Id, LookKeys(item, new List<string>()));
             SyncValue(item);
         }
 
@@ -266,6 +282,9 @@ namespace Decentralized
         }
 
         /// <summary>当前面的底图名与叠加图名：正面三个维度，背面丝印与贴纸；烧毁的卡不叠。</summary>
+        /// <summary>实物上的风扇数：由真实芯片的档次决定（低档次的板子套高档次的壳，风扇数露馅）。</summary>
+        public static int FansOf(Unit u) => Hardware.FanCount[Hardware.Specs[u.FakeOf ?? u.Model].Tier];
+
         public static string LookKeys(GameItem item, List<string> overlays)
         {
             var u = ToUnit(item);
@@ -275,18 +294,18 @@ namespace Decentralized
             if (u.Dead) return back ? "gpu_burnt_b" : "gpu_burnt_f";
             if (!back)
             {
-                if (l.Fan > 0) overlays.Add("gpu_ov_fan" + l.Fan);
+                if (l.Fan > 0) overlays.Add($"gpu_ov_fan{l.Fan}_{FansOf(u)}");
                 if (l.Fingers > 0) overlays.Add("gpu_ov_fin" + l.Fingers);
-                if (l.Bracket > 0) overlays.Add("gpu_ov_brk" + l.Bracket);
+                if (l.Bracket > 0) overlays.Add("gpu_ov_brk1");
             }
             else
             {
                 // 丝印：0 标称型号；1 印的是真实芯片型号；2 标称型号但字歪（重印过）
                 string model = l.Print == 1 && u.FakeOf != null ? u.FakeOf : u.Model;
                 overlays.Add((l.Print == 2 ? "gpu_ov_txs_" : "gpu_ov_txt_") + model.ToLowerInvariant());
-                if (l.Sticker > 0) overlays.Add("gpu_ov_stk" + l.Sticker);
+                if (l.Sticker == 2) overlays.Add("gpu_ov_stk2");
             }
-            return brand + (back ? "_b" : "_f");
+            return brand + (back ? "_b" : "_f_t" + Hardware.Specs[u.FakeOf ?? u.Model].Tier);
         }
 
         public static Sprite ModSprite(string key)