Copper Mercenaries/铜佣兵团

New: Leader Helmet series — craft by surrounding the matching helmet with 8 copper ingots (leather/iron/golden/diamond/netherite). While equipped, all players and mercenaries within 10 blocks continuously receive Regeneration and Strength (leather I, iron II+I, golden I+II, diamond II+II, netherite III+II)

New: Copper Level system — click the Upgrade button in the recruit screen and spend 20 copper ingots to level up; every level grants +1 max health to you and all of your mercenaries (both already hired and newly hired). Levels persist across death and re-login, and the current level is shown at the top of the recruit screen

Visual: all item icons redrawn — the Recruiting Block gets a new copper-and-chest texture, and the 7 mercenary spawn eggs each get profession-specific colors plus a class emblem ; the creative tab icon updates with it

新增：领导头盔系列——用 8 个铜锭环绕对应材质头盔合成（皮革/铁/金/钻石/下界合金 5 种）；装备后以 10 格为半径，范围内的所有玩家与佣兵持续获得生命恢复与力量（皮革 I、铁 II+I、金 I+II、钻石 II+II、下界合金 III+II）

新增：铜等级系统——在招募界面点击「升级」按钮消耗 20 铜锭升 1 级，每级使玩家自身与全部佣兵（含已雇佣与新雇佣）生命上限 +1；等级永久保留（死亡重生/重进存档不丢失），招募界面上方显示当前等级

视觉：全新绘制全部物品图标——招募方块改为「铜块 + 箱子」主题贴图；7 种佣兵刷怪蛋改为各职业专属配色并加入职业徽记，创造模式标签页图标同步更新