Add MultiGPU support for various model loaders and encoders

web/docs/WanVideoTextEncodeSingleMultiGPU.md

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+# WanVideoTextEncodeSingleMultiGPU
+
+`WanVideoTextEncodeSingleMultiGPU` encodes a single prompt string (no negative branch) using a Wan T5 encoder while honouring the device you supply. Use it for LoRA control channels or scenarios where only one conditioning embedding is required.
+
+## Inputs
+
+### Required
+
+| Parameter | Data Type | Description |
+| --- | --- | --- |
+| `prompt` | `STRING` | Prompt text to encode. |
+
+### Optional
+
+| Parameter | Data Type | Description |
+| --- | --- | --- |
+| `t5` | `WANTEXTENCODER` | Encoder pair from `LoadWanVideoT5TextEncoderMultiGPU`. |
+| `load_device` | `MULTIGPUDEVICE` | Device that will perform encoding. |
+| `force_offload` | `BOOLEAN` | Offload linked models after encoding completes. |
+| `model_to_offload` | `WANVIDEOMODEL` | Wan diffusion model to move while encoding to free VRAM. |
+| `use_disk_cache` | `BOOLEAN` | Store/reuse embeddings on disk for repeat runs. |
+
+## Outputs
+
+| Output Name | Data Type | Description |
+| --- | --- | --- |
+| `text_embeds` | `WANVIDEOTEXTEMBEDS` | Encoded embeddings ready for Wan samplers. |