env vars not loading properly

`config.py` should be
```python
from pydantic_settings import BaseSettings


class Settings(BaseSettings):
    debug: bool = False

    APPLE_PUBLIC_KEYS_URL: str
    APP_BUNDLE_ID: str
    CHALLENGE_EXPIRY_SECONDS: int
    JWT_SECRET: str
    JWT_EXPIRY_SECONDS: int

    class Config:
        env_file = ".env"

settings = Settings()
```