List Webhook Events

List every subscribable webhook event with its payload schema.

Public; no auth required. Returns {events: [{name, description, payload_schema_ref, example_payload}, ...]}. The payload_schema_ref is an OpenAPI components.schemas pointer (e.g. #/components/schemas/GroupMentionPayload) — combined with this app's GET /openapi.json, SDK generators produce a typed WebhookEvent discriminated-union that consumers can match on. The example_payload is a canonical sample so a developer can preview the wire shape without firing a real event.

Source of truth: app/schemas/webhook_payloads.py. When a new event is added there it automatically appears here — no manual registration step.