Error loading script: forge_layerdiffusion.py

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Hello. The script stopped loading at startup.

```
*** Error loading script: forge_layerdiffusion.py
Traceback (most recent call last):
File "C:\ai\webui\modules\scripts.py", line 541, in load_scripts
script_module = script_loading.load_module(scriptfile.path)
File "C:\ai\webui\modules\script_loading.py", line 10, in load_module
module_spec.loader.exec_module(module)
File "", line 883, in exec_module
File "", line 241, in _call_with_frames_removed
File "C:\ai\webui\extensions\sd-forge-layerdiffuse\scripts\forge_layerdiffusion.py", line 15, in
from lib_layerdiffusion.models import TransparentVAEDecoder, TransparentVAEEncoder
File "C:\ai\webui\extensions\sd-forge-layerdiffuse\lib_layerdiffusion\models.py", line 10, in
from diffusers.models.unets.unet_2d_blocks import UNetMidBlock2D, get_down_block, get_up_block
ModuleNotFoundError: No module named 'diffusers.models.unets'
```

Start with extensions/sd-forge-layerdiffuse/scripts/forge_layerdiffusion.py and lib_layerdiffusion/models.py, focusing on the failing diffusers import and the installed module layout. Reproduce startup loading in the Forge WebUI and confirm that forge_layerdiffusion.py loads without the ModuleNotFoundError.

Written by the indexing model from the issue text.