fix(mcp): 修改环境变量配置方式

[NayukiChiba]

Modifications / 改动点

• 将环境变量配置工具从 env 修改为 uv 字段
• 更新 JSON 格式以包含 env 字段
• 确保 MCP 服务器的环境变量配置更加清晰

close #8494

• 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

• 😊 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 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

Documentation:

• Revise English and Chinese MCP usage guides to show configuring server environment variables via the env field and uv command instead of the env CLI tool.

[sourcery-ai]

Hey - I've found 1 issue

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location path="docs/en/use/mcp.md" line_range="75" />
<code_context>
 ```

-If the MCP server you need requires environment variables to configure something (e.g. access token), you could use the command-line tool `env`:
+If the MCP server you need requires environment variables to configure something (e.g. access token), you could use the `env` field:

 ```json
</code_context>
<issue_to_address>
**nitpick (typo):** Consider adding an article before "access token" for grammatical correctness.

Specifically, update "(e.g. access token)" to "(e.g. an access token)" for clarity.

```suggestion
If the MCP server you need requires environment variables to configure something (e.g. an access token), you could use the `env` field:
```
</issue_to_address>

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[sourcery-ai]

nitpick (typo): Consider adding an article before "access token" for grammatical correctness.

Specifically, update "(e.g. access token)" to "(e.g. an access token)" for clarity.

Suggested change

	If the MCP server you need requires environment variables to configure something (e.g. access token), you could use the `env` field:
	If the MCP server you need requires environment variables to configure something (e.g. an access token), you could use the `env` field:

[gemini-code-assist]

Code Review

This pull request updates both the English and Chinese documentation for MCP server configuration to demonstrate using the env field in the JSON configuration instead of relying on the env command-line tool. There are no review comments, and I have no feedback to provide.

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