Add MultiGPU support for various model loaders and encoders

web/docs/WanVideoDecodeMultiGPU.md

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+# WanVideoDecodeMultiGPU
+
+`WanVideoDecodeMultiGPU` decodes Wan latents back into frames using the VAE you provide, pinning decode work to the chosen MultiGPU device and safeguarding validation for tiled decode settings.
+
+## Inputs
+
+### Required
+
+| Parameter | Data Type | Description |
+| --- | --- | --- |
+| `vae` | `WANVAE` | VAE pair from a Wan VAE loader. |
+| `load_device` | `MULTIGPUDEVICE` | Device that will run the decode. |
+| `samples` | `LATENT` | Latent tensor to decode. |
+| `enable_vae_tiling` | `BOOLEAN` | Enables tiled decoding to reduce VRAM usage. |
+| `tile_x` | `INT` | Tile width in pixels. |
+| `tile_y` | `INT` | Tile height in pixels. |
+| `tile_stride_x` | `INT` | Horizontal stride between tiles. |
+| `tile_stride_y` | `INT` | Vertical stride between tiles. |
+
+### Optional
+
+| Parameter | Data Type | Description |
+| --- | --- | --- |
+| `normalization` | `STRING` | Switch between default and min-max output normalisation. |
+
+## Outputs
+
+| Output Name | Data Type | Description |
+| --- | --- | --- |
+| `images` | `IMAGE` | Decoded video frames or image batch. |