Filter tools openai server task

[sonic182]

Overview

closes #22722

In issue, I describe the bug. The fix is to emit correct SSE events when tool calls in llama-server, for most openai clients

Additional information

Before (combined chunk):

{"index":0,"id":"...","type":"function","function":{"name":"query_agent","arguments":"{"}}

After (split into two chunks):

{"index":0,"id":"...","type":"function","function":{"name":"query_agent"}}
{"index":0,"function":{"arguments":"{"}}

Requirements

• I have read and agree with the contributing guidelines
• AI usage disclosure: YES — Claude Code was used to help identify the root cause and locate the fix.

[ggml-gh-bot]

Hi @sonic182, thanks for your contribution!

Per our contribution guidelines, the automated PR checker found the following issue(s) that need your attention:

• AI-generated content: This project does not accept PRs, descriptions or commit messages that are fully or predominantly AI-generated. If you have used AI to assist you in writing code, please make sure to disclose that explicitly.

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[sonic182]

not predominant AI for pr description