Add Japanese draft of Related Work section ...

Three paragraphs covering: manual attenuated-plaque scoring via IVUS
(wu2011), deep-learning-based IVUS segmentation (nishi2021), and the
existing landscape of clinical/angiographic no-reflow prediction
models that don't use IVUS (li2025) — motivating this manuscript's
integration of IVUS imaging with clinical/lesion information.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>