Add support for MiniMax H3 Ref2Vid training

extensions_built_in/diffusion_models/__init__.py

@@ -19,7 +19,7 @@ from .prx_pixel_t2i import PRXPixelT2IModel
 from .krea2 import Krea2Model
 from .boogu_image import BooguImageModel, BooguImageEditModel
 from .mageflow import MageFlowModel, MageFlowEditModel
-from .minimax_h3 import MinimaxH3Model
+from .minimax_h3 import MinimaxH3Model, MinimaxH3Ref2VAModel
 
 AI_TOOLKIT_MODELS = [
     # put a list of models here
@@ -57,4 +57,5 @@ AI_TOOLKIT_MODELS = [
     MageFlowModel,
     MageFlowEditModel,
     MinimaxH3Model,
+    MinimaxH3Ref2VAModel,
 ]