FEAT: Add subfolder selection to LoadImage node

Add subfolder selection to LoadImage node, allowing to list images from ComfyUI/input/subfolders (if any).


For people like me who almost exclusively do img2img the input/ folder gets really messy very quickly, easily can get to multiple hundreds of files in there with no way to categorize.

I could be mistaken but I believe this addition would not really add complexity or confusion to users, simply set as default and it can be ignored.

There are some great custom nodes that I use a lot such as Image Sequence Loader by melMass, that allow to enter custom path, perfect for files with specific naming convention (ie: animation sequence). But for general purpose I have not found a custom node solution, hence the feature suggestion.