feat(providers): add GMI Cloud as a first-class API-key provider (#11955)

Add GMI Cloud (api.gmi-serving.com) as a full first-class API-key provider
with built-in auth, aliases, model catalog, CLI entry points, auxiliary client
routing, context length resolution, doctor checks, env var tracking, and docs.

- auth.py: ProviderConfig for 'gmi' (api_key, GMI_API_KEY / GMI_BASE_URL)
- providers.py: HermesOverlay with extra_env_vars for models.dev detection
- models.py: curated slash-form model catalog; live /v1/models fetch
- main.py: 'gmi' in _named_custom_provider_map and --provider choices
- model_metadata.py: _URL_TO_PROVIDER, _PROVIDER_PREFIXES, dedicated
  context-length probe block (GMI's /models has authoritative data)
- auxiliary_client.py: alias entries; _compat_model fix for slash-form
  models on cached aggregator-style clients; gmi aux default model
- doctor.py: GMI in provider connectivity checks
- config.py: GMI_API_KEY / GMI_BASE_URL in OPTIONAL_ENV_VARS
- conftest.py: explicit GMI_BASE_URL clearing (not caught by _API_KEY suffix)
- docs: providers.md, environment-variables.md, fallback-providers.md,
  configuration.md, quickstart.md (expands provider table)

Co-authored-by: Isaac Huang <isaachuang@Isaacs-MacBook-Pro.local>

hermes_cli/models.py

@@ -278,6 +278,14 @@ _PROVIDER_MODELS: dict[str, list[str]] = {
         "trinity-large-preview",
         "trinity-mini",
     ],
+    "gmi": [
+        "zai-org/GLM-5.1-FP8",
+        "deepseek-ai/DeepSeek-V3.2",
+        "moonshotai/Kimi-K2.5",
+        "google/gemini-3.1-flash-lite-preview",
+        "anthropic/claude-sonnet-4.6",
+        "openai/gpt-5.4",
+    ],
     "opencode-zen": [
         "kimi-k2.5",
         "gpt-5.4-pro",
@@ -709,7 +717,6 @@ class ProviderEntry(NamedTuple):
     label: str
     tui_desc: str   # detailed description for `hermes model` TUI
 
-
 CANONICAL_PROVIDERS: list[ProviderEntry] = [
     ProviderEntry("nous",           "Nous Portal",              "Nous Portal (Nous Research subscription)"),
     ProviderEntry("openrouter",     "OpenRouter",               "OpenRouter (100+ models, pay-per-use)"),
@@ -735,6 +742,7 @@ CANONICAL_PROVIDERS: list[ProviderEntry] = [
     ProviderEntry("alibaba",        "Alibaba Cloud (DashScope)","Alibaba Cloud / DashScope Coding (Qwen + multi-provider)"),
     ProviderEntry("ollama-cloud",   "Ollama Cloud",             "Ollama Cloud (cloud-hosted open models — ollama.com)"),
     ProviderEntry("arcee",          "Arcee AI",                 "Arcee AI (Trinity models — direct API)"),
+    ProviderEntry("gmi",            "GMI Cloud",                "GMI Cloud (multi-model direct API)"),
     ProviderEntry("kilocode",       "Kilo Code",                "Kilo Code (Kilo Gateway API)"),
     ProviderEntry("opencode-zen",   "OpenCode Zen",             "OpenCode Zen (35+ curated models, pay-as-you-go)"),
     ProviderEntry("opencode-go",    "OpenCode Go",              "OpenCode Go (open models, $10/month subscription)"),
@@ -769,6 +777,8 @@ _PROVIDER_ALIASES = {
     "stepfun-coding-plan": "stepfun",
     "arcee-ai": "arcee",
     "arceeai": "arcee",
+    "gmi-cloud": "gmi",
+    "gmicloud": "gmi",
     "minimax-china": "minimax-cn",
     "minimax_cn": "minimax-cn",
     "claude": "anthropic",
@@ -1849,6 +1859,19 @@ def provider_model_ids(provider: Optional[str], *, force_refresh: bool = False)
                     return live
             except Exception:
                 pass
+    if normalized == "gmi":
+        try:
+            from hermes_cli.auth import resolve_api_key_provider_credentials
+
+            creds = resolve_api_key_provider_credentials("gmi")
+            api_key = str(creds.get("api_key") or "").strip()
+            base_url = str(creds.get("base_url") or "").strip()
+            if api_key and base_url:
+                live = fetch_api_models(api_key, base_url)
+                if live:
+                    return live
+        except Exception:
+            pass
     if normalized == "custom":
         base_url = _get_custom_base_url()
         if base_url: