在工作流中调用插件，没有传递 ConversationId 和 BotId

**Describe the bug**

在工作流中调用插件，没有传递 ConversationId 和 BotId

**To Reproduce**

1. 创建对话流，在对话流中调用插件

2. 在智能体中引用对话流

3. 测试

缺少 X-AIPlugin-Conversation-ID 和 X-AIPlugin-Bot-ID

**Expected behavior**

将会话的 ConversationId 和 BotId 传递插件

**相关 Issue**

#2190

Start from the workflow path that invokes a plugin and trace how the conversation context is passed into the plugin request. Verify the ConversationId and BotId values used by the agent are included as X-AIPlugin-Conversation-ID and X-AIPlugin-Bot-ID. Done means reproducing the workflow and observing both headers in the plugin request, with behavior aligned to related issue #2190.

Written by the indexing model from the issue text.