https://switchboard.spot/ https://switchboard.spot/docs https://switchboard.spot/guides/no-backend-ai-chat https://switchboard.spot/guides/openai-api-key-browser https://switchboard.spot/guides/ai-usage-billing-stripe https://switchboard.spot/docs/no-backend.md https://switchboard.spot/docs/integration.md https://switchboard.spot/docs/billing.md https://switchboard.spot/docs/cli.md https://switchboard.spot/llms.txt https://switchboard.spot/switchboard-knowledge.md https://switchboard.spot/v1/openapi.json