"""Configuration settings.""" from pathlib import Pathfrom typing import Optional from pydantic import Fieldfrom pydantic_settings import BaseSettings  class Settings(BaseSettings):    """Controller settings."""     # API    host: str = "0.0.0.0"    port: int = 8080     # Authentication    api_key: Optional[str] = Field(default=None, description="Bearer token for API access")     # Inference backend    inference_port: int = Field(default=8000, description="Port where vLLM/SGLang runs")     # Storage    data_dir: Path = Field(default=Path("./data"))    db_path: Path = Field(default=Path("./data/controller.db"))     # Models    models_dir: Path = Field(default=Path("/models"), description="Directory containing model weights")     # SGLang (optional - only needed if using SGLang backend)    sglang_python: Optional[str] = Field(        default=None,        description="Python path for SGLang (e.g., /path/to/sglang/venv/bin/python)",    )     # TabbyAPI (optional - only needed if using TabbyAPI/ExLlamaV3 backend)    tabby_api_dir: Optional[str] = Field(        default=None,        description="TabbyAPI installation directory",    )     model_config = {        "env_prefix": "VLLM_STUDIO_",        "env_file": ".env",        "extra": "ignore",    }  settings = Settings()