Get controller content by type and name.
Supports both single-file controllers (controller.py) and package-style controllers (controller/controller.py).
Args: controller_type: Type of the controller controller_name: Name of the controller
Returns: Dictionary with controller name, type, and content
Raises: HTTPException: 404 if controller not found
Basic authentication header of the form Basic <encoded-value>, where <encoded-value> is the base64-encoded string username:password.
Types of controllers available
directional_trading, market_making, generic Successful Response