Use get_journal_info() for journal path resolution; add --path flag
Replace inline load_dotenv + os.environ.get in get_status() with a call
to think.utils.get_journal_info(), which provides platform-default
fallback when JOURNAL_PATH is not set anywhere.
Add --path top-level flag that prints the resolved journal path and
exits, suitable for shell substitution: cd
Status output now shows the path source annotation (shell/dotenv/default).