feat(particle): support continuous Birth sub-emitters - #3071
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背景
Birth 子发射器此前只在父粒子创建时固定发射一次,目标系统的发射率、距离发射、Burst 与延迟均未按父粒子独立运行。父粒子模拟又发生在 Renderer 准备渲染阶段,子发射结果会受到组件注册顺序和相机裁剪影响;同时父速度只保留了方向,无法表达绕轴、径向及其他模块共同形成的完整轨迹速度。
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Summary by CodeRabbit
velocityOverLifetimelinear velocity integration.