fix(zerogpu): restore Blackwell runtime patches

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fix(sm_120): disable xformers flash3 dispatcher (no FA3 kernel for Blackwell)

fix(zerogpu): neutralize warp.init in parent to prevent fork-after-cuInit hang

debug: inject ZeroGPU stderr probes (schedule/handler/worker_init)

fix: force open3d to CPU-only to keep ZeroGPU worker CUDA context clean

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