fix(Python): pass UTF-8 byte length for log dir option

[Windsland52]

Tasker.set_log_dir encoded the path as UTF-8 but passed the character count to MaaGlobalSetOption. Non-ASCII paths were truncated before native path conversion on Windows, which could surface as an uncaught C++ filesystem exception.

Use the encoded byte length and cover set_log_dir with a non-ASCII path in the binding test.

Summary by Sourcery

修复 Python Tasker 日志目录配置，以正确处理 UTF-8 路径，并在测试中为包含非 ASCII 字符的日志目录路径补充覆盖。

Bug 修复：

• 通过使用 UTF-8 字节长度而不是字符数来修正传递给 MaaGlobalSetOption 的日志目录选项长度，避免非 ASCII 路径被截断。

测试：

• 扩展 Python 绑定测试，以验证 Tasker.set_log_dir 在 Windows 风格路径中使用包含非 ASCII 字符的日志目录路径时能够正常工作。

Original summary in English

Summary by Sourcery

Fix Python Tasker log directory configuration to correctly handle UTF-8 paths and add coverage for non-ASCII log directory paths in tests.

Bug Fixes:

• Correct the length passed to MaaGlobalSetOption for the log directory option by using the UTF-8 byte length instead of the character count to avoid truncation of non-ASCII paths.

Tests:

• Extend Python binding tests to verify Tasker.set_log_dir works with a non-ASCII log directory path on Windows-like paths.

[sourcery-ai]

Hey - 我在这里提供了一些整体性的反馈：

• 在 set_log_dir 中，建议显式使用 'utf-8' 进行编码（例如 str(path).encode('utf-8')），并将变量命名为 encoded_path_bytes 或类似名称，以明确传递给 MaaGlobalSetOption 的长度是字节长度，而不是字符数量。

给 AI 代理的提示

Please address the comments from this code review:

## Overall Comments
- 在 `set_log_dir` 中，建议显式使用 `'utf-8'` 进行编码（例如 `str(path).encode('utf-8')`），并将变量命名为 `encoded_path_bytes` 或类似名称，以明确传递给 `MaaGlobalSetOption` 的长度是字节长度，而不是字符数量。

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Original comment in English

Hey - I've left some high level feedback:

• In set_log_dir, consider explicitly encoding with 'utf-8' (e.g., str(path).encode('utf-8')) and naming the variable encoded_path_bytes or similar to make it clear the length passed to MaaGlobalSetOption is a byte length and not a character count.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- In `set_log_dir`, consider explicitly encoding with `'utf-8'` (e.g., `str(path).encode('utf-8')`) and naming the variable `encoded_path_bytes` or similar to make it clear the length passed to `MaaGlobalSetOption` is a byte length and not a character count.

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[Windsland52]

@MistEO review

[MistEO]

🤖 非 ASCII 路径这个坑修得对，测试也带了，LGTM

[Windsland52]

等 MaaXYZ/MaaUtils#16 合并