fix: keep-alive never fired due to next_run_time=None in APScheduler

fix: accurate Space disk stats using os.scandir + MB precision in dashboard

fix: disk stats now show Space allocation (50GB) not host machine disk

chore: add clean deployment script + document mandatory workflow

fix: dashboard not rendering + container-aware memory stats

feat: add status dashboard + keep-alive state tracking

docs: comprehensive documentation and inline comments across all files

feat: initial commit — hf-vps base environment