feat: support _sdpa_cudnn backend for cp #504
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Z-Image: L20x1 baseline 6.71s -> L20x2 Ulysses (w/ compile), 3.50s -> + _sdpa_cudnn, 3.14s -> + tuned, 3.08s -> + fp8-dq per_row, 2.29s -> + DBCache (w/ SCM) 1.92s
TODO: + sage, + async ulysses cp