fix(exif): handle non-standard EXIF with UserComment in IFD0#942
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Some images store UserComment directly in IFD0 with type BYTE instead of the standard Exif sub-IFD with type UNDEFINED, causing piexif to return empty results. Add a raw EXIF fallback to extract and decode UserComment in both ComfyUI detection and webui gen info reading. - Add _extract_usercomment_from_raw_exif() for raw IFD0 parsing - Add detection fallback in is_img_created_by_comfyui() for JPEG/WEBP - Add extraction fallback in read_sd_webui_gen_info_from_image() - In dev mode, bypass DB cache for unedited images to aid debugging
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Some images store UserComment directly in IFD0 with type BYTE instead of the standard Exif sub-IFD with type UNDEFINED, causing piexif to return empty results. Add a raw EXIF fallback to extract and decode UserComment in both ComfyUI detection and webui gen info reading.