修正邮件接收时间和发件人展示

docs/import/reusable/integrations/superagent-agentbus-portable-integration-guide.md

@@ -308,6 +308,8 @@ GET <AGENTBUS_WS_URL>?ready=1
 - `source.channel`
 - `source.external_message_id`
 - `source.external_conversation_id`
+- payload 或 source 中的 `received_at`
+- `source.sent_at`
 - frame id
 - session id
 - sender
@@ -322,6 +324,9 @@ GET <AGENTBUS_WS_URL>?ready=1
 | `source.channel` | `channel` |
 | `source.external_message_id` | `externalMessageId`，作为幂等键组成部分 |
 | `source.external_conversation_id` | `externalConversationId` |
+| payload 或 source 中的 `received_at` | `receivedAt`，作为消息来源接收时间 |
+| `source.sent_at` | `sourceSentAt`，作为消息来源发送时间 |
+| sender | `senderSummary`，是否打码由项目业务和权限策略决定 |
 | frame id | `providerFrameId` |
 | session id | `providerSessionId` |
 | payload 规范 JSON | `payloadJson` 与 `payloadSha256` |