Minimax H3 Multi Ref workflow for low VRAM

Use Minimax H3 Director instead of previous Ksampler subgraphadd a button in Model subgraph to enable TE-Speed (OSS)add a button in Model subgraph to Low VRAM optionadd lora stackadd new user guideKeep interface clean and tidy, un-spaghettify用Minimax H3 Director取代前版本的Ksampler subgraph在Model subgraph加了一個開關給TE-Speed (OSS)在Model subgraph加了一個選擇給Low VRAM加入一個lora stack加了用家指南保持介面乾淨整潔非意粉化

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