feat: add z.ai/GLM, Kimi/Moonshot, MiniMax as first-class providers

Adds 4 new direct API-key providers (zai, kimi-coding, minimax, minimax-cn)
to the inference provider system. All use standard OpenAI-compatible
chat/completions endpoints with Bearer token auth.

Core changes:
- auth.py: Extended ProviderConfig with api_key_env_vars and base_url_env_var
  fields. Added providers to PROVIDER_REGISTRY. Added provider aliases
  (glm, z-ai, zhipu, kimi, moonshot). Added auto-detection of API-key
  providers in resolve_provider(). Added resolve_api_key_provider_credentials()
  and get_api_key_provider_status() helpers.
- runtime_provider.py: Added generic API-key provider branch in
  resolve_runtime_provider() — any provider with auth_type='api_key'
  is automatically handled.
- main.py: Added providers to hermes model menu with generic
  _model_flow_api_key_provider() flow. Updated _has_any_provider_configured()
  to check all provider env vars. Updated argparse --provider choices.
- setup.py: Added providers to setup wizard with API key prompts and
  curated model lists.
- config.py: Added env vars (GLM_API_KEY, KIMI_API_KEY, MINIMAX_API_KEY,
  etc.) to OPTIONAL_ENV_VARS.
- status.py: Added API key display and provider status section.
- doctor.py: Added connectivity checks for each provider endpoint.
- cli.py: Updated provider docstrings.

Docs: Updated README.md, .env.example, cli-config.yaml.example,
cli-commands.md, environment-variables.md, configuration.md.

Tests: 50 new tests covering registry, aliases, resolution, auto-detection,
credential resolution, and runtime provider dispatch.

Inspired by PR #33 (numman-ali) which proposed a provider registry approach.
Credit to tars90percent (PR #473) and manuelschipper (PR #420) for related
provider improvements merged earlier in this changeset.

hermes_cli/config.py

@@ -170,6 +170,86 @@ OPTIONAL_ENV_VARS = {
         "category": "provider",
         "advanced": True,
     },
+    "GLM_API_KEY": {
+        "description": "Z.AI / GLM API key (also recognized as ZAI_API_KEY / Z_AI_API_KEY)",
+        "prompt": "Z.AI / GLM API key",
+        "url": "https://z.ai/",
+        "password": True,
+        "category": "provider",
+        "advanced": True,
+    },
+    "ZAI_API_KEY": {
+        "description": "Z.AI API key (alias for GLM_API_KEY)",
+        "prompt": "Z.AI API key",
+        "url": "https://z.ai/",
+        "password": True,
+        "category": "provider",
+        "advanced": True,
+    },
+    "Z_AI_API_KEY": {
+        "description": "Z.AI API key (alias for GLM_API_KEY)",
+        "prompt": "Z.AI API key",
+        "url": "https://z.ai/",
+        "password": True,
+        "category": "provider",
+        "advanced": True,
+    },
+    "GLM_BASE_URL": {
+        "description": "Z.AI / GLM base URL override",
+        "prompt": "Z.AI / GLM base URL (leave empty for default)",
+        "url": None,
+        "password": False,
+        "category": "provider",
+        "advanced": True,
+    },
+    "KIMI_API_KEY": {
+        "description": "Kimi / Moonshot API key",
+        "prompt": "Kimi API key",
+        "url": "https://platform.moonshot.cn/",
+        "password": True,
+        "category": "provider",
+        "advanced": True,
+    },
+    "KIMI_BASE_URL": {
+        "description": "Kimi / Moonshot base URL override",
+        "prompt": "Kimi base URL (leave empty for default)",
+        "url": None,
+        "password": False,
+        "category": "provider",
+        "advanced": True,
+    },
+    "MINIMAX_API_KEY": {
+        "description": "MiniMax API key (international)",
+        "prompt": "MiniMax API key",
+        "url": "https://www.minimax.io/",
+        "password": True,
+        "category": "provider",
+        "advanced": True,
+    },
+    "MINIMAX_BASE_URL": {
+        "description": "MiniMax base URL override",
+        "prompt": "MiniMax base URL (leave empty for default)",
+        "url": None,
+        "password": False,
+        "category": "provider",
+        "advanced": True,
+    },
+    "MINIMAX_CN_API_KEY": {
+        "description": "MiniMax API key (China endpoint)",
+        "prompt": "MiniMax (China) API key",
+        "url": "https://www.minimaxi.com/",
+        "password": True,
+        "category": "provider",
+        "advanced": True,
+    },
+    "MINIMAX_CN_BASE_URL": {
+        "description": "MiniMax (China) base URL override",
+        "prompt": "MiniMax (China) base URL (leave empty for default)",
+        "url": None,
+        "password": False,
+        "category": "provider",
+        "advanced": True,
+    },
 
     # ── Tool API keys ──
     "FIRECRAWL_API_KEY": {