fix: ensure embedding dimensions are returned as integers in providers

[Soulter]

Modifications / 改动点

• 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

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Checklist / 检查清单

• 😊 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。/ If there are new features added in the PR, I have discussed it with the authors through issues/emails, etc.
• 👀 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”。/ My changes have been well-tested, and "Verification Steps" and "Screenshots" have been provided above.
• 🤓 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了 requirements.txt 和 pyproject.toml 文件相应位置。/ 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.
• 😮 我的更改没有引入恶意代码。/ My changes do not introduce malicious code.

Summary by Sourcery

确保所有 embedding 提供方在配置中始终返回整数类型的 embedding 维度。

Bug 修复：

• 将 Gemini embeddings 中配置的 embedding_dimensions 强制转换为整数。
• 将 OpenAI embeddings 中配置的 embedding_dimensions 强制转换为整数。

Original summary in English

Summary by Sourcery

Ensure embedding providers always return integer embedding dimensions from configuration.

Bug Fixes:

• Coerce configured embedding_dimensions to integers for Gemini embeddings.
• Coerce configured embedding_dimensions to integers for OpenAI embeddings.

[sourcery-ai]

Hey - 我在这里给出了一些总体反馈：

• 如果配置值是非数字字符串，使用 int() 对 embedding_dimensions 进行类型转换会抛出 ValueError；建议在加载配置时就对该设置进行规范化/校验，或者在转换时使用更安全的方式，并提供清晰的错误信息，以避免难以排查的崩溃。

给 AI Agent 的提示

请根据这次代码审查中的评论进行修改：

## 总体评论
- 如果配置值是非数字字符串，使用 `int()` 对 `embedding_dimensions` 进行类型转换会抛出 `ValueError`；建议在加载配置时就对该设置进行规范化/校验，或者在转换时使用更安全的方式，并提供清晰的错误信息，以避免难以排查的崩溃。

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Original comment in English

Hey - I've left some high level feedback:

• Casting embedding_dimensions with int() will raise a ValueError if the config value is a non-numeric string; consider normalizing/validating this setting at config load time or adding a safer conversion with a clear error message to avoid hard-to-diagnose crashes.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Casting `embedding_dimensions` with `int()` will raise a `ValueError` if the config value is a non-numeric string; consider normalizing/validating this setting at config load time or adding a safer conversion with a clear error message to avoid hard-to-diagnose crashes.

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