Black market in Web3 page, shelf UI, no dead drop, tech and GPU goods; rules moved to Web3 handbook

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

src/Decentralized/Unlock.cs

@@ -44,6 +44,7 @@ namespace Decentralized
             Items.Give(ModHelper.SpawnItem(Items.Rig));
             Items.Give(ModHelper.SpawnItem(Items.GpuId("RTX60")));
             Items.Give(ModHelper.SpawnItem(Items.Guide));
+            Items.Give(ModHelper.SpawnItem(Items.Web3Guide));
             Log.Info("已加入 Web3 治理社区");
         }
     }