{"message":"n8n Google Sheets & Webhook API Server","endpoints":{"health":"GET /health","googleSheets":{"listTabs":"GET /api/sheets/:spreadsheetId/tabs","deleteTabs":"DELETE /api/sheets/:spreadsheetId/tabs","deleteColumns":"DELETE /api/sheets/:spreadsheetId/columns","deleteRows":"DELETE /api/sheets/:spreadsheetId/rows","deleteRowsConditional":"DELETE /api/sheets/:spreadsheetId/rows/conditional"},"webhook":{"validateChatwork":"POST /api/webhook/chatwork/validate"},"serviceAccount":{"status":"GET /api/oauth/google/status","test":"GET /api/oauth/google/test"}}}