feat(ws): P1-4 实现 broadcast_message_status 实时广播

backend/app/services/ws_manager.py

@@ -250,6 +250,55 @@ class ConnectionManager:
         for employee_id in employee_ids:
             await self.send_to_employee(employee_id, data)
 
+    # ==========================================================================
+    # 消息状态广播（P1-4）
+    # ==========================================================================
+
+    async def broadcast_message_status(
+        self,
+        conv_id: str,
+        msg_id: str,
+        status: str,
+        participant_ids: List[str],
+        extra: dict = None,
+    ) -> int:
+        """向会话所有参与方广播消息状态变更。
+
+        用于撤回/已读/删除等事件的实时推送。
+
+        Args:
+            conv_id: 会话ID
+            msg_id: 消息ID
+            status: 新状态 (sent / delivered / read / recalled / deleted)
+            participant_ids: 参与方ID列表 (agent_id + employee_id)
+            extra: 额外数据 (可选，如 recall_by / recall_at)
+
+        Returns:
+            推送到客户端数量
+        """
+        # 构建消息
+        payload = {
+            "type": "message_status",
+            "conv_id": conv_id,
+            "msg_id": msg_id,
+            "status": status,
+            **(extra or {}),
+        }
+
+        # 分别推送给坐席和员工
+        sent_count = 0
+
+        for pid in participant_ids:
+            # 判断是坐席还是员工
+            if pid in self.active_connections:
+                await self.send_to_agent(pid, payload)
+                sent_count += 1
+            elif pid in self.employee_connections:
+                await self.send_to_employee(pid, payload)
+                sent_count += 1
+
+        return sent_count
+
     # ==========================================================================
     # 辅助方法
     # ==========================================================================