Add MultiGPU support for various model loaders and encoders

web/docs/WanVideoEncodeMultiGPU.md

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+# WanVideoEncodeMultiGPU
+
+`WanVideoEncodeMultiGPU` encodes single images into Wan latents using the selected device, mirroring WanVideo's image encoder while adding explicit device routing and tiled encode safeguards.
+
+## Inputs
+
+### Required
+
+| Parameter | Data Type | Description |
+| --- | --- | --- |
+| `vae` | `WANVAE` | VAE pair for encoding. |
+| `load_device` | `MULTIGPUDEVICE` | Device that will run the encode. |
+| `image` | `IMAGE` | Image tensor to convert to latents. |
+| `enable_vae_tiling` | `BOOLEAN` | Enables tiled encoding to lower 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 |
+| --- | --- | --- |
+| `noise_aug_strength` | `FLOAT` | Adds noise before encoding for motion workflows. |
+| `latent_strength` | `FLOAT` | Scales encoded latents. |
+| `mask` | `MASK` | Optional mask to limit encoding region. |
+
+## Outputs
+
+| Output Name | Data Type | Description |
+| --- | --- | --- |
+| `samples` | `LATENT` | Encoded Wan latent tensor. |