feat(hunyuan-image3): add multi-micro hybrid parallelism - #1350
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Run autoregressive decoding with TP4 and denoising with TP2+SP2 over one TP2-loaded ABAB weight layout. Add a Hopper BF16 grouped multi-micro MoE operator that reuses routing across two zero-copy micro-shard views, avoids per-micro FlashInfer calls during denoising, and preserves a single TP2 reduction without phase-time weight movement.
Include strict topology validation, a production launcher, and regression coverage for weight views, phase dispatch, and four-rank NCCL groups.