fix(kimi): reconcile sk-kimi- routing with Anthropic SDK URL semantics

Follow-ups after salvaging xiaoqiang243's kimi-for-coding patches:

- KIMI_CODE_BASE_URL: drop trailing /v1 (was /coding/v1).
  The /coding endpoint speaks Anthropic Messages, and the Anthropic SDK
  appends /v1/messages internally. /coding/v1 + SDK suffix produced
  /coding/v1/v1/messages (a 404). /coding + SDK suffix now yields
  /coding/v1/messages correctly.
- kimi-coding ProviderConfig: keep legacy default api.moonshot.ai/v1 so
  non-sk-kimi- moonshot keys still authenticate. sk-kimi- keys are
  already redirected to api.kimi.com/coding via _resolve_kimi_base_url.
- doctor.py: update Kimi UA to claude-code/0.1.0 (was KimiCLI/1.30.0)
  and rewrite /coding base URLs to /coding/v1 for the /models health
  check (Anthropic surface has no /models).
- test_kimi_env_vars: accept KIMI_CODING_API_KEY as a secondary env var.

E2E verified:
  sk-kimi-<key>  → https://api.kimi.com/coding/v1/messages (Anthropic)
  sk-<legacy>    → https://api.moonshot.ai/v1/chat/completions (OpenAI)
  UA: claude-code/0.1.0, x-api-key: <sk-kimi-*>

hermes_cli/doctor.py

@@ -943,18 +943,22 @@ def run_doctor(args):
             try:
                 import httpx
                 _base = os.getenv(_base_env, "") if _base_env else ""
-                # Auto-detect Kimi Code keys (sk-kimi-) → api.kimi.com
+                # Auto-detect Kimi Code keys (sk-kimi-) → api.kimi.com/coding/v1
+                # (OpenAI-compat surface, which exposes /models for health check).
                 if not _base and _key.startswith("sk-kimi-"):
                     _base = "https://api.kimi.com/coding/v1"
-                # Anthropic-compat endpoints (/anthropic) don't support /models.
-                # Rewrite to the OpenAI-compat /v1 surface for health checks.
+                # Anthropic-compat endpoints (/anthropic, api.kimi.com/coding
+                # with no /v1) don't support /models.  Rewrite to the OpenAI-compat
+                # /v1 surface for health checks.
                 if _base and _base.rstrip("/").endswith("/anthropic"):
                     from agent.auxiliary_client import _to_openai_base_url
                     _base = _to_openai_base_url(_base)
+                if base_url_host_matches(_base, "api.kimi.com") and _base.rstrip("/").endswith("/coding"):
+                    _base = _base.rstrip("/") + "/v1"
                 _url = (_base.rstrip("/") + "/models") if _base else _default_url
                 _headers = {"Authorization": f"Bearer {_key}"}
                 if base_url_host_matches(_base, "api.kimi.com"):
-                    _headers["User-Agent"] = "KimiCLI/1.30.0"
+                    _headers["User-Agent"] = "claude-code/0.1.0"
                 _resp = httpx.get(
                     _url,
                     headers=_headers,