MiniMax APIs (global and China) don't support /v1/models, causing
hermes doctor to always show HTTP 404 even with valid API keys.
Skip the HTTP check for these providers and show '(key configured)'
when the API key is present.
Cherry-picked from PR #822 by Bartok9, rebased onto current main.
Fixes#811
Co-authored-by: Bartok9 <259807879+Bartok9@users.noreply.github.com>