Add MultiGPU support for various model loaders and encoders

web/docs/WanVideoVACEEncodeMultiGPU.md

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+# WanVideoVACEEncodeMultiGPU
+
+`WanVideoVACEEncodeMultiGPU` encodes VACE reference inputs for WanVideo workflows while respecting your chosen device. It patches the base encoder to run on the MultiGPU device and to reuse Wan offload settings automatically.
+
+## Inputs
+
+### Required
+
+| Parameter | Data Type | Description |
+| --- | --- | --- |
+| `vae` | `WANVAE` | VAE pair to use during encoding. |
+| `load_device` | `MULTIGPUDEVICE` | Device that will execute encoding. |
+| `width` | `INT` | Target latent width. |
+| `height` | `INT` | Target latent height. |
+| `num_frames` | `INT` | Number of frames to encode. |
+| `strength` | `FLOAT` | Overall conditioning strength. |
+| `vace_start_percent` | `FLOAT` | Step fraction where VACE influence begins. |
+| `vace_end_percent` | `FLOAT` | Step fraction where VACE influence ends. |
+
+### Optional
+
+| Parameter | Data Type | Description |
+| --- | --- | --- |
+| `input_frames` | `IMAGE` | Input frames used for conditioning. |
+| `ref_images` | `IMAGE` | Reference imagery to encode. |
+| `input_masks` | `MASK` | Masks applied during encoding. |
+| `prev_vace_embeds` | `WANVIDIMAGE_EMBEDS` | Prior VACE embeds to reuse or blend. |
+| `tiled_vae` | `BOOLEAN` | Enable tiled encode for lower VRAM usage. |
+
+## Outputs
+
+| Output Name | Data Type | Description |
+| --- | --- | --- |
+| `vace_embeds` | `WANVIDIMAGE_EMBEDS` | Encoded VACE embeddings for Wan samplers. |