fix(doctor): skip /models health check for providers that don't support it

Xiaomi MiMo's /v1/models endpoint returns 401 even with a valid API key,
causing hermes doctor to falsely report 'invalid API key'.

Add a `supports_health_check` field to ProviderProfile (default True).
Providers whose /models endpoint doesn't support auth verification can
set it to False. The doctor's dynamic provider discovery now reads this
field instead of hardcoding True.

The xiaomi provider plugin sets supports_health_check=False.

hermes_cli/doctor.py

@@ -287,7 +287,8 @@ def _build_apikey_providers_list() -> list:
                 (_pp.models_url or (_pp.base_url.rstrip("/") + "/models"))
                 if _pp.base_url else None
             )
-            _static.append((_label, _key_vars, _models_url, _base_var, True))
+            _hc = getattr(_pp, "supports_health_check", True)
+            _static.append((_label, _key_vars, _models_url, _base_var, _hc))
     except Exception:
         pass
     return _static

plugins/model-providers/xiaomi/__init__.py

@@ -8,6 +8,7 @@ xiaomi = ProviderProfile(
     aliases=("mimo", "xiaomi-mimo"),
     env_vars=("XIAOMI_API_KEY",),
     base_url="https://api.xiaomimimo.com/v1",
+    supports_health_check=False,  # /v1/models returns 401 even with valid key
 )
 
 register_provider(xiaomi)

providers/base.py

@@ -40,6 +40,7 @@ class ProviderProfile:
     base_url: str = ""
     models_url: str = ""  # explicit models endpoint; falls back to {base_url}/models
     auth_type: str = "api_key"   # api_key|oauth_device_code|oauth_external|copilot|aws_sdk
+    supports_health_check: bool = True  # False → doctor skips /models probe for this provider
 
     # ── Model catalog ─────────────────────────────────────────
     # fallback_models: curated list shown in /model picker when live fetch fails.