AcceleratedOptimizer.eval() does not reach through DeepSpeed wrapper, silently saving train-view schedule-free weights

当 Accelerate 配合 DeepSpeed Zero 与 schedule-free 优化器(如 ProdigyPlusScheduleFree)时, AcceleratedOptimizer.eval() 不会像 train() 那样穿透 DeepSpeed 额外包装的优化器层,导致调用
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