KillAura_Forge/neoForge

- Removed redundant renderBackground calls, resolving severe stuttering issues when opening the UI on Minecraft 1.21.1.
- Extended UI open auto-fill capability to detect the nearest entity ID within 20 blocks, the block ID beneath your feet, and offhand item IDs.
- Refined small animal logic so that only vanilla smallest-size Slimes are affected by the "Attack Baby Animals" toggle; non-vanilla smallest slimes are always attacked and no longer treated as passive animals.

移除了冗余的renderBackground，修复了1.21.1打开UI时的严重卡顿问题
打开UI时可额外检测并记录20格内距离最近的实体ID、脚下的方块ID、副手的物品ID
现在只有原版的最小的史莱姆会受到攻击小动物功能影响，其他的最小的史莱姆都会被攻击，不算作动物。