fix: docker permission denied for data directory

Dockerfile

@@ -21,6 +21,10 @@ COPY dashboard.py .
 
 # Create non-root user (Hugging Face requirement)
 RUN useradd -m -u 1000 user
+
+# Create data directory and set permissions
+RUN mkdir -p /app/data && chown -R user:user /app
+
 USER user
 
 # Set environment variables