Create: Heat Pipe

更新日志：

新增："烫脚"机制——站在有热量的导热管上会持续受伤（与岩浆块机制一致）；潜行、或穿冰霜行者附魔的鞋子可免疫；网络热量归零后自动不再烫脚。

Added: the "hot underfoot" mechanic — standing on a heated Heat Pipe deals damage (same as magma); sneaking or Frost Walker grants immunity; it stops once the network cools to zero.