feat: Add Single User authentication to Selfhosted (#870)

* Single user/password for selfhosted

* fix revision id latest migration

server/runserver.sh

@@ -2,6 +2,10 @@
 
 if [ "${ENTRYPOINT}" = "server" ]; then
     uv run alembic upgrade head
+    # Provision admin user if password auth is configured
+    if [ -n "${ADMIN_EMAIL:-}" ] && [ -n "${ADMIN_PASSWORD_HASH:-}" ]; then
+        uv run python -m reflector.tools.provision_admin
+    fi
     uv run uvicorn reflector.app:app --host 0.0.0.0 --port 1250
 elif [ "${ENTRYPOINT}" = "worker" ]; then
     uv run celery -A reflector.worker.app worker --loglevel=info