vLLM reversed yesterday's DeepSeek-V4.1-Flash padding and proved zero output error on GB200.

PR #57204 removes the MegaMoE intermediate-width padding that had widened the 2304 checkpoint width to 2560. The bundled DeepGEMM uses layout::Data(..., false) for activation-scale rows, so the old 16-byte TMA row alignment rationale no longer applies, and removing it strips 10% of the intermediate dimension from the padded expert GEMMs while keeping native shared-expert fusion. Validation on four GB200 GPUs across token counts 1 through 2048 reported 48 of 48 comparisons with exactly zero output error, and prior GSM8K runs at TP4/EP4 held at 96.36%.