Carpet RMS Addition

Bug Fixes

• Fixed ExceptionInInitializerError when players join the server on MC 1.21.4. The mixin was calling add() on an immutable List.of() from CustomPayloadS2CPacket's configuration codec initialization, causing UnsupportedOperationException. All @ModifyArg handlers now create a mutable ArrayList copy before adding entries.

修复

• 修复 MC 1.21.4 中玩家加入服务端时抛出 ExceptionInInitializerError 的问题。mixin 直接对 CustomPayloadS2CPacket 配置 codec 初始化时创建的不可变 List.of() 调用 add()，导致 UnsupportedOperationException。所有 @ModifyArg 处理器现在会先创建可变 ArrayList 副本再添加条目。