Added

• Added peek.transitionTicks config option to control peek extend/retract transition duration.
• Added peek.modelOffset config option to control third-person model lateral offset.
• Added AnimState inner class to manage per-player peek animation state.
• 新增 peek.transitionTicks 配置项，控制探头伸出/收回的过渡时长。
• 新增 peek.modelOffset 配置项，控制第三人称模型横向偏移。
• 新增 AnimState 内部类，管理每玩家的探头动画状态。

Changes

• Changed peek animation from linear step advance to fixed-duration easeOutCubic with start-lock and render-frame interpolation.
• 更改探头动画：由线性步长推进改为固定时长 + easeOutCubic 缓动 + 起点锁定 + 渲染帧插值。