Configure my existing OpenClaw installation with a custom MandAPI provider while preserving channels, workspace and tool policy. Locate the active config with openclaw config file and keep a backup. Add models.providers.mandapi with baseUrl https://api.mandapi.com/v1, api openai-completions, apiKey ${MANDAPI_API_KEY}, and one exact account-visible MODEL_ID. Keep the real key private and ensure the actual local process or service inherits it. Check for an agent models.json override if settings differ. Validate configuration, select mandapi/MODEL_ID and guide a small local text check followed by a read-only project summary. Check MandAPI usage and explain restoration. Do not create messaging connections or deploy a public service.