fix(core): 修复 partial 工具的延迟类型注解解析

[Shuhan Si (2gg-bit)]

Why are these changes needed?

修复 FunctionTool(functools.partial(...)) 在函数使用延迟求值类型注解时抛出 NameError 的问题。get_typed_signature 已解包 partial，却仍从 partial 对象读取 __globals__；该对象没有这个属性，Annotated 和用户定义的模型类型因此无法解析。

现在从被包装函数读取全局命名空间，同时继续使用 partial 的签名，保留已经绑定的位置参数/关键字参数行为。新增测试覆盖两种绑定方式、Annotated、模型返回类型、实际工具执行，以及未包装函数。

Related issue number

本地复现；已检索开放的 partial/get_typed_signature PR，未发现相同修复。

Checks

• Documentation changes（内部 bug 修复，无公开 API 或文档变化）
• Added regression tests
• All auto checks passed（提交后等待 GitHub CI；本地检查如下）

在仓库 uv 锁定开发环境运行 autogen-core 的 poe fmt、poe lint、poe mypy、poe pyright 全部通过；poe test：229 passed。新增用例修改前 2 失败、1 通过，修复后全部通过。为 core 现有测试补齐同一 checkout 的 autogen-ext，以及锁文件版本的 Ollama 和 email-validator。没有修改依赖清单或锁文件；未运行其他包及文档构建。

AI 披露：代码、测试和中文描述由 OpenAI Codex 生成并自动检查，尚无人工复核。

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