Upside-down monitor

**Is your feature request related to a problem? Please describe.**
It's an existing feature in Uptime-Kuma called upside-down that offers to make a monitor up by default, and down when the conditions are met. IE when you curl on a push monitor it turns it down so you can trigger an alert only when needed.

Look for existing monitor types and their state logic in the codebase, likely in a `monitor` or `check` package. Understand how monitor states (up/down) are currently determined and stored. The feature requires inverting the default state logic and triggering alerts on the down condition. Check for configuration models and alerting mechanisms to integrate the new 'upside-down' flag.

Written by the indexing model from the issue text.