Feat: support tree structured deep-research policy. (#12559)

### What problem does this PR solve?

#12558
### Type of change

- [x] New Feature (non-breaking change which adds functionality)

pyproject.toml

@@ -177,7 +177,6 @@ url = "https://pypi.tuna.tsinghua.edu.cn/simple"
 [tool.setuptools]
 packages = [
     'agent',
-    'agentic_reasoning',
     'api',
     'deepdoc',
     'graphrag',