def _rest_request(self, method: str, endpoint: str, payload: Optional[dict] = None, timeout: Optional[int] = None) -> Optional[Any]:
        method = method.upper()
        if method not in ("POST", "PUT", "DELETE", "PATCH", "GET"):
            self._last_error = f"_rest_request: неподдерживаемый метод {method}"
            return None
        url = f"{self._base}/api/v2.0/{endpoint}"
        t = timeout if timeout is not None else self.valves.request_timeout
        try:
            r = requests.request(method, url, headers=self._headers, json=payload if payload is not None else {}, timeout=t, verify=self.valves.verify_ssl)
            # v2.1.2: автоматический fallback POST → GET при 405 (Method Not Allowed).
            # Это часто встречается в TrueNAS 25.10: некоторые эндпоинты каталога
            # исторически были POST, но в новых версиях стали GET.
            if r.status_code == 405 and method == "POST":
                try:
                    r2 = requests.get(url, headers=self._headers, params=payload or {}, timeout=t, verify=self.valves.verify_ssl)
                    if r2.status_code in (200, 201, 202, 204):
                        if not r2.text:
                            return {"status": "ok", "http_code": r2.status_code, "via": "GET-fallback"}
                        try:
                            data = r2.json()
                            if isinstance(data, dict):
                                data["_via"] = "GET-fallback"
                            return data
                        except Exception:
                            return {"status": "ok", "text": r2.text, "http_code": r2.status_code, "_via": "GET-fallback"}
                except Exception:
                    pass  # вернёмся к исходной ошибке ниже
            if r.status_code in (200, 201, 202, 204):
                if not r.text:
                    return {"status": "ok", "http_code": r.status_code}
                try:
                    return r.json()
                except Exception:
                    return {"status": "ok", "text": r.text, "http_code": r.status_code}
            self._last_error = f"{method} {endpoint} → HTTP {r.status_code}: {r.text[:400]}"
            return None
        except requests.exceptions.SSLError as e:
            self._last_error = f"SSL-ошибка {method} {endpoint}: {e}"
            return None
        except requests.exceptions.ConnectionError as e:
            self._last_error = f"Соединение {method} {endpoint}: {e}"
            return None
        except requests.exceptions.Timeout:
            self._last_error = f"Таймаут {method} {endpoint} (> {t}с)"
            return None
        except Exception as e:
            self._last_error = f"{method} {endpoint}: {type(e).__name__}: {e}"
            return None