Refactor Wan model imports and update script paths in pyproject.toml; transition from wan to wan2 module structure for improved organization and clarity.

mlx_video/models/wan2/config.py

@@ -1,7 +1,7 @@
 from dataclasses import dataclass
 from typing import Tuple, Union
 
-from mlx_video.models.ltx.config import BaseModelConfig
+from mlx_video.models.ltx_2.config import BaseModelConfig
 
 
 @dataclass