HiDream-O1-Image-Dev MLX runtime

Adapted for Rapid-MLX from the text-to-image runtime published in
mlx-community/HiDream-O1-Image-Dev-mlx-bf16 at commit
33c7a00bce8e3410304f83ec408a15a1eb6782df.

The Rapid-MLX adaptation removes the standalone CLI, conversion, editing,
multi-reference, diagnostic, and file-output paths and integrates generation
with Rapid's image-engine lifecycle, cancellation, progress, and in-memory PNG
transport. No model weights are redistributed.
