Webhook deliveries

Build Racecamp's webhooks area: endpoint CRUD with subscribed events and status, one-time
signing secret with rotation, per-endpoint delivery log with payload detail and
replay. Nitro Kit, dummy data.

Webhooks are the seams of your platform — make them a joy to manage. Build the webhooks
area for Racecamp, a project management app from 27 Seagulls: an endpoint list with subscribed
events and health status, add and edit endpoints, a signing secret shown exactly once
with rotation, and a per-endpoint delivery log with payload detail and a replay action.

Server-side everything, with the states a platform developer expects: success, retrying,
paused, and the moments secrets are revealed or rotated. This is a UI showcase — dummy
endpoints and deliveries, nothing really fires. Use Nitro Kit components throughout.