add acestep models

diffsynth/utils/state_dict_converters/ace_step_dit.py

@@ -0,0 +1,15 @@
+def AceStepDiTStateDictConverter(state_dict):
+    """
+    Convert ACE-Step DiT state dict to add 'model.' prefix for wrapper class.
+
+    The wrapper class has self.model = AceStepConditionGenerationModel(config),
+    so all keys need to be prefixed with 'model.'
+    """
+    state_dict_ = {}
+    keys = state_dict.keys() if hasattr(state_dict, 'keys') else state_dict
+    for k in keys:
+        v = state_dict[k]
+        if not k.startswith("model."):
+            k = "model." + k
+        state_dict_[k] = v
+    return state_dict_