- _read_process_cmdline: /proc and 'ps' are unavailable on Windows,
so process cmdline was always empty. Add psutil fallback (already
a hard dependency used by _pid_exists in the same module).
- _record_looks_like_gateway: argv paths use backslashes on Windows
but patterns use forward slashes/dots, so the fallback record check
always failed. Normalize backslashes to forward slashes before
matching.
Together these caused get_running_pid() to return None on Windows
even when the gateway process is alive, making the dashboard report
gateway as 'stopped' despite it functioning normally.
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