处理 API 渠道事件

{
  "schemaVersion": 2,
  "id": "event-id",
  "sourceEventId": "source-event-id",
  "sequence": 12,
  "type": "message.created",
  "occurredAt": "2026-07-24T08:00:00Z",
  "tenantId": "tenant-id",
  "channelId": "channel-id",
  "conversationId": "conversation-id",
  "external": {
    "threadId": "thread-001",
    "customerId": "customer-001"
  },
  "source": { "type": "agent", "id": "agent-id", "name": "Agent" },
  "data": {}
}