o1-mini request failed

**Describe the bug**
If I select o1-mini to request, no matter what content, it will response
o1-mini: "Unsupported value: 'messages[0].role' does not support 'system' with this model."

**To Reproduce**
Steps to reproduce the behavior:
1. create a prompt node
2. request with o1-mini model
3. submit, then this bug happened.

**Expected behavior**
Should response normal like o3-mini model

**Screenshots**

version: 0.3.6.1

Start at the prompt node entry point and trace the o1-mini request, comparing it with the o3-mini path. Use the reproduction steps to verify the request succeeds without the reported role error and produces a normal response.

Written by the indexing model from the issue text.