Revert restart.sh systemd auto-restart, keep dev setup.sh workflow

restart.sh

@@ -21,14 +21,5 @@ stop_pid_file() {
 stop_pid_file "$ROOT_DIR/.api.pid" "API server"
 stop_pid_file "$ROOT_DIR/.vite.pid" "Vite server"
 
-# ── If installed as a systemd service, restart that instead ──────────────────
-if command -v systemctl >/dev/null 2>&1 && systemctl list-unit-files study-app.service >/dev/null 2>&1; then
-  echo "Found study-app systemd service — restarting it..."
-  sudo systemctl restart study-app
-  sleep 1
-  systemctl status study-app --no-pager -l
-  exit 0
-fi
-
 echo "Restarting via setup.sh..."
 exec "$ROOT_DIR/setup.sh"