Notification channels: Email, Slack, Microsoft Teams

[WhiteMuush]

Why

Today the only outbound integration is a raw webhook. Teams expect alerts in the channels they already watch: Email, Slack, Microsoft Teams. Real-time notification of high-risk activity is a baseline expectation.

Scope

• Channel types layered on the existing Webhook model: Email (SMTP), Slack (incoming webhook), Teams (connector).
• Per-channel severity threshold and event filtering.
• Templated message payloads; test-send action (mirrors the existing webhook test route).

Hooks

• Webhook model, src/app/api/webhooks/, new src/lib/notify/ channel adapters.