fix(provider): bundle the STT health check sample inside the package

[Joker-Principal]

在测试语音转文字的模型时出现错误，相关日志：

[Core][ERRO][v4.28.1] [sources.sensevoice_selfhosted_source:77]: 处理音频文件时出错: [Errno 2] No such file or directory: 'C:\\Users\\XXX\\AppData\\Roaming\\uv\\tools\\astrbot\\Lib\\site-packages\\samples\\stt_health_check.wav'

原因是 hatch 的打包目录是 astrbot，没有包含 samples

Modifications / 改动点

移动了 samples 文件夹到 astrbot 文件夹中，并修改读取它的代码

• This is NOT a breaking change. / 这不是一个破坏性变更。

Screenshots or Test Results / 运行截图或测试结果

在 venv 中执行 python -m build; pip install --no-deps dist/astrbot-4.28.1-py3-none-any.whl，samples 文件夹有被安装到 .venv\Lib\site-packages\astrbot\samples

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Checklist / 检查清单

• 😊 If there are new features added in the PR, I have discussed it with the authors through issues/emails, etc.
  / 如果 PR 中有新加入的功能，已经通过 Issue / 邮件等方式和作者讨论过。

• 👀 My changes have been well-tested, and "Verification Steps" and "Screenshots" have been provided above.
  / 我的更改经过了良好的测试，并已在上方提供了“验证步骤”和“运行截图”。

• 📚 I checked the affected WebUI instructions and screenshots in docs/zh and docs/en against the changed navigation, page structure, and labels, and updated them in this PR (or explained why no documentation update is needed). For renamed, moved, or merged entry points, I included an old entry → new entry mapping in the documentation and changelog.
  / 我已对照变化后的 WebUI 入口、页面结构和术语，核对并在本 PR 中更新 docs/zh 和 docs/en 的相关操作说明与截图（或说明无需更新文档的原因）。入口改名、移动或合并时，已在文档和 changelog 中补充 旧入口 → 新入口 对照。

• 🤓 I have ensured that no new dependencies are introduced, OR if new dependencies are introduced, they have been added to the appropriate locations in requirements.txt and pyproject.toml.
  / 我确保没有引入新依赖库，或者引入了新依赖库的同时将其添加到 requirements.txt 和 pyproject.toml 文件相应位置。

• 😮 My changes do not introduce malicious code.
  / 我的更改没有引入恶意代码。

Summary by Sourcery

Bug Fixes:

• Fix the STT provider health check so its bundled sample audio is found in installed packages.

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

Sourcery assessment

Approved.

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