Fix uid 1000 error: create user and set cache env vars early

Dockerfile

@@ -1,6 +1,9 @@
 # Dockerfile for Hugging Face Spaces deployment
 FROM python:3.10-slim
 
+# Create a user with uid 1000 (typical HF Spaces user)
+RUN useradd -m -u 1000 user
+
 # Install system dependencies including Rust (needed for rustbpe)
 RUN apt-get update && apt-get install -y \
     build-essential \

app.py

@@ -7,8 +7,12 @@ This file is automatically detected and run by HF Spaces.
 import os
 import sys
 
-# Set environment variables for HF Spaces
+# Set environment variables for HF Spaces BEFORE any other imports
 os.environ.setdefault("NANOCHAT_BASE_DIR", "/data")
+os.environ.setdefault("TORCHINDUCTOR_CACHE_DIR", "/data/.cache/torch")
+os.environ.setdefault("HF_HOME", "/data/.cache/huggingface")
+os.environ.setdefault("TORCH_HOME", "/data/.cache/torch")
+os.environ.setdefault("XDG_CACHE_HOME", "/data/.cache")
 
 # Download model from HF if not present
 def download_model():