Alert routing

Every alert always lands in the in-app Alerts queue. Routing only decides what additionally goes out:

• Send to Slack — an incoming-webhook URL; the setup guide (create a Slack app → Incoming Webhooks → pick a channel → copy the URL) is right on the page.
• Send to a webhook — a generic JSON POST for email relays, SIEMs, Teams.

A minimum severity threshold applies to outbound delivery only — the page previews the effect in plain words (“High and critical alerts also go to Slack; everything stays in the queue regardless”). Each destination has its own Send test with a visible result. Per-policy route to admin is assignment, not transport.