Add MultiGPU support for various model loaders and encoders

web/docs/WanVideoTextEncodeMultiGPU.md

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+# WanVideoTextEncodeMultiGPU
+
+`WanVideoTextEncodeMultiGPU` encodes paired positive/negative prompts using a WanVideo T5 encoder while respecting the MultiGPU device you choose. The node can temporarily offload Wan models to free VRAM before encoding and supports optional disk caching for embeddings.
+
+## Inputs
+
+### Required
+
+| Parameter | Data Type | Description |
+| --- | --- | --- |
+| `positive_prompt` | `STRING` | Prompt text for the conditioned branch. |
+| `negative_prompt` | `STRING` | Prompt text for the unconditioned branch. |
+
+### Optional
+
+| Parameter | Data Type | Description |
+| --- | --- | --- |
+| `t5` | `WANTEXTENCODER` | Encoder pair from `LoadWanVideoT5TextEncoderMultiGPU`; defaults to the global Wan encoder if omitted. |
+| `load_device` | `MULTIGPUDEVICE` | Device to run encoding on; also controls temporary model moves. |
+| `force_offload` | `BOOLEAN` | When true, offloads the model after encoding completes. |
+| `model_to_offload` | `WANVIDEOMODEL` | Wan diffusion model to move to the offload device prior to encoding. |
+| `use_disk_cache` | `BOOLEAN` | Enable Wan disk cache for repeated prompt reuse. |
+
+## Outputs
+
+| Output Name | Data Type | Description |
+| --- | --- | --- |
+| `text_embeds` | `WANVIDEOTEXTEMBEDS` | Dictionary of positive and negative embeddings ready for `WanVideoSamplerMultiGPU`. |