Solutions for dependency errors in Portable

## Execute the following commands in order:

> Run the command in your embedded Python directory—for example, `D:\ComfyUI_windows_portable\python_embeded`.
> To open a terminal in this location, hold Shift while right-clicking and select **"Open in Terminal"** from the context menu.
> This command is designed for **CMD**. If you're using **PowerShell**, replace the initial `python` with `.\python.exe`.

1. Upgrade pip and build tools
- `python -m pip install --upgrade pip setuptools wheel build`

2. Install missing dependencies required for compiling wheels
- `python -m pip install wheel-stub`
- `python -m pip install nvidia-vfx` **OR** alternative `python -m pip install -U --no-build-isolation nvidia-vfx --index-url https://pypi.nvidia.com`
*(Use this alternative command if you encounter issues with the first one)*