Function _normalize_str

src/core/model_resolver.py:417–421

(value: Any)

        (aspect_ratio, image_size) 归一化后的值
    """
    def _normalize_str(value: Any) -> Optional[str]:
        if not isinstance(value, str):
            return None
        text = value.strip()
        return text if text else None

    def _read_value(obj: Any, *keys: str) -> Any:
        if obj is None: