Fix file permissions for SQLite database creation

Dockerfile

@@ -41,4 +41,8 @@ EXPOSE 7860
 # Next.js will use this PORT variable automatically
 ENV PORT=7860
 
+# Hugging Face Spaces run as a non-root user (uid 1000).
+# Give full permissions to /app so SQLite can be created.
+RUN chmod -R 777 /app
+
 CMD ["/app/run.sh"]