Use snapshot_download instead of hf CLI (fixes build)

app.py

@@ -8,7 +8,6 @@ Usage: python app.py
 """
 import base64
 import os
-import subprocess
 import tempfile
 import time
 from pathlib import Path
@@ -16,6 +15,7 @@ from uuid import uuid4
 
 import spaces
 import torch
+from huggingface_hub import snapshot_download
 from PIL import Image
 from fastapi.responses import HTMLResponse, FileResponse, JSONResponse
 import gradio as gr
@@ -30,14 +30,7 @@ import example_inputs_b64 as _b64
 # Download checkpoints from HuggingFace Hub (VAST-AI/TripoSplat)
 # ----------------------------------------------------------------------------
 
-subprocess.run(
-    [
-        "hf", "download",
-        "VAST-AI/TripoSplat",
-        "--local-dir", "ckpts"
-    ],
-    check=True,
-)
+snapshot_download(repo_id="VAST-AI/TripoSplat", local_dir="ckpts")
 
 # ----------------------------------------------------------------------------
 # Pipeline (loaded once at startup)