| 12345678910111213141516171819202122232425262728293031 | import osfrom typing import Optionalfrom dataclasses import dataclasstry:    # Load variables from a local .env if present    from dotenv import load_dotenv  # type: ignore    load_dotenv()except Exception:    # If python-dotenv isn't installed, skip silently. Env vars still work.    pass@dataclassclass Settings:    llm_provider: str = os.getenv("LLM_PROVIDER", "mock").lower()    default_model: str = os.getenv("LLM_MODEL", "mock-echo-001")    temperature: float = float(os.getenv("LLM_TEMPERATURE", "1.0"))    openai_api_key: Optional[str] = os.getenv("OPENAI_API_KEY")    dashscope_api_key: Optional[str] = (        os.getenv("DASHSCOPE_API_KEY") or os.getenv("APIKEY")    )    upload_path: Optional[str] = os.getenv(        "UPLOAD_PATH", "https://api.piaoquantv.com/ad/file/upload"    )def get_settings() -> Settings:    return Settings()
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