get https://api.voicecreator.ai/api/v1/voice-assistants/
Retrieve a specific voice assistant by ID.
Parameters: assistant_id (int): The ID of the voice assistant to retrieve. request (Request): The FastAPI request object. db (AsyncSession): The database session (injected). organization_id (Optional[int]): The organization ID from the API key or request.
Returns: VoiceAssistant: The requested voice assistant.
Raises: HTTPException: - 400: If organization ID is missing - 404: If the assistant is not found or not accessible - 500: If an unexpected error occurs during retrieval