Remove deprecated stubs for video conversion and generation; introduce new weight conversion and generation scripts for Wan2.2 models in MLX.

mlx_video/convert.py

@@ -1,2 +0,0 @@
-"""Stub — delegates to mlx_video.models.ltx_2.utils."""
-from mlx_video.models.ltx_2.utils import *  # noqa: F401,F403

mlx_video/generate.py

@@ -1,5 +0,0 @@
-"""Entry point stub — delegates to mlx_video.models.ltx_2.generate."""
-from mlx_video.models.ltx_2.generate import main, generate_video
-
-if __name__ == "__main__":
-    main()