fix: disable stdout buffering in run.py so pipeline logs appear in terminal

fix: restore /app/ mount, add / redirect to home.html

fix: serve frontend at / instead of /app/ for cleaner URLs

fix: Unicode stdout crash on Windows (UTF-8 encoding)

docs: add auth/DB/login report; fix run.py printed URLs

feat: rebrand to PaperMate, ARR review rubric, feedback form, UI improvements

Initial implementation of AI research paper review system