Add huggingface_hub login for gated model access

app.py

@@ -14,7 +14,11 @@ import numpy as np
 import spaces
 import torch
 import bpy
-from huggingface_hub import snapshot_download
+from huggingface_hub import snapshot_download, login
+
+# Login with HF_TOKEN if available
+if os.environ.get("HF_TOKEN"):
+    login(token=os.environ.get("HF_TOKEN"))
 from PIL import Image
 
 # Clone sam-3d-body repo if not exists