[Cherry-Pick][Optimization]Fix tool parser (#7079)

[luukunn]

Motivation

💡 If this PR is a Cherry Pick, the PR title needs to follow the format by adding the [Cherry-Pick] label at the very beginning and appending the original PR ID at the end. For example, [Cherry-Pick][CI] Add check trigger and logic(#5191)

💡 如若此PR是Cherry Pick，PR标题需遵循格式，在最开始加上[Cherry-Pick]标签，以及最后面加上原PR ID，例如[Cherry-Pick][CI] Add check trigger and logic(#5191)

Modifications

Usage or Command

Accuracy Tests

Checklist

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[paddle-bot]

Thanks for your contribution!

[Copilot]

Pull request overview

该 PR 作为 cherry-pick，主要调整 OpenAI entrypoint 下 Ernie X1 的 tool parser 解析逻辑（包含非流式与流式），并显著补充单元测试覆盖；同时对 Ernie 4.5 VL thinking 的流式解析移除“空 chunk 跳过”逻辑。

Changes:

• 重写 ErnieX1ToolParser.extract_tool_calls：改为正则提取 <tool_call>...</tool_call> 并用 json.loads 解析。
• 重写 ErnieX1ToolParser.extract_tool_calls_streaming：引入基于计数与 partial_json_parser 的流式增量解析逻辑。
• 扩充 test_ernie_x1_tool_parser.py：新增大量分支/集成场景用例；并在 ernie_45_vl_thinking_tool_parser.py 移除空 delta 的 early-return。

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 6 comments.

File	Description
fastdeploy/entrypoints/openai/tool_parsers/ernie_x1_tool_parser.py	调整 Ernie X1 tool call 的非流式与流式解析实现、日志与依赖导入
tests/entrypoints/openai/tool_parsers/test_ernie_x1_tool_parser.py	新增/重构 Ernie X1 tool parser 的单测覆盖，包含大量 streaming 分支用例
fastdeploy/entrypoints/openai/tool_parsers/ernie_45_vl_thinking_tool_parser.py	流式解析不再跳过空白 delta chunk

[codecov-commenter]

Codecov Report

❌ Patch coverage is 93.47826% with 9 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (release/2.5@242ed02). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...points/openai/tool_parsers/ernie_x1_tool_parser.py	93.47%	5 Missing and 4 partials ⚠️

Additional details and impacted files

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##             release/2.5    #7167   +/-   ##
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  Hits                   ?    37496           
  Misses                 ?    14033           
  Partials               ?     2695           

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