fix: clearer LICENSE_CLIENT_KEY setup and ignore empty env overrides.

license.env now fills blank LICENSE_* values; error text points to copying license.env.example.

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/license/license_lib.py

@@ -46,9 +46,13 @@ def _load_license_env() -> None:
             continue
         key, value = raw.split("=", 1)
         key = key.strip().lstrip("\ufeff")
-        if not key or key in os.environ:
+        if not key:
             continue
-        os.environ[key] = value.strip().strip('"').strip("'")
+        val = value.strip().strip('"').strip("'")
+        # 仅在未设置或为空时写入，避免空 LICENSE_CLIENT_KEY= 挡住 license.env
+        if (os.environ.get(key) or "").strip():
+            continue
+        os.environ[key] = val
 
 
 def api_base_url() -> str:
@@ -158,7 +162,7 @@ def _parse_expires_at(value: str | None) -> float | None:
 def _http_json(method: str, path: str, body: dict[str, Any]) -> dict[str, Any]:
     key = client_key()
     if not key:
-        return {"ok": False, "message": "未配置 LICENSE_CLIENT_KEY（与授权站 CLIENT_API_KEY 一致）"}
+        return {"ok": False, "message": "未配置 LICENSE_CLIENT_KEY。请在仓库根目录复制 license.env.example 为 license.env，填入与授权站相同的 CLIENT_API_KEY，然后重启服务。"}
     url = f"{api_base_url()}{path}"
     payload = json.dumps(body).encode("utf-8")
     req = Request(