The MiniMax OAuth API endpoints have moved from api.minimax.io to
account.minimax.io and the old paths now respond with HTTP 307.
httpx defaults to follow_redirects=False (unlike requests), so the
device-code and token-refresh flows fail with "Temporary Redirect".
Adds follow_redirects=True to the two httpx.Client instances in
hermes_cli/auth.py used by the MiniMax OAuth flow. This is forward-
compatible -- if endpoints move again, the redirect chain is
followed automatically.
Repro before patch:
curl -i -X POST https://api.minimax.io/oauth/code # -> 307
curl -i -X POST https://api.minimax.io/oauth/token # -> 307
Verified end-to-end against a real MiniMax Plus account on macOS;
the existing tests/test_minimax_oauth.py suite (15 tests) still
passes.