更新readme,细化直播配置

[callmefisher]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @callmefisher, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

此拉取请求旨在通过更新 README.md 文件，为用户提供更清晰、更细致的七牛直播功能配置指南。重点在于明确了在使用 qiniu-mcp-server 时，如何正确设置直播功能的鉴权凭证，以确保用户能够顺利启用和使用直播服务。

Highlights

• 文档更新: 在 README.md 中新增了关于直播功能配置的详细说明。
• 直播鉴权模式: 详细阐述了七牛直播功能支持的两种鉴权模式：通过配置 QINIU_ACCESS_KEY/QINIU_SECRET_KEY 或 QINIU_LIVE_API_KEY。

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[gemini-code-assist]

Code Review

本次更新主要是在 README.md 文件中为直播功能增加了两种鉴权模式的配置说明。我注意到新添加的文档部分格式可以优化，以便于用户阅读和复制代码片段。我已经提出了具体的修改建议，主要是将说明文字和 JSON 配置代码块分开，并使用正确的 Markdown 语法来增强可读性。

[gemini-code-assist]

这部分新增的说明格式可以优化一下，以提高可读性。目前，说明文字和 JSON 配置示例被包裹在一个大的代码块中，这使得文本部分也以等宽字体显示，并且 JSON 没有语法高亮。

建议将说明文字作为普通 Markdown 文本，并将每个 JSON 示例放入独立的 json 代码块中。这样不仅结构更清晰，用户也更容易复制配置。我还对文本做了一些微调，并修正了 JSON 中的缩进问题。

   > **注意**：如果只使用直播功能，可选择以下两种鉴权模式之一。

   **模式一：使用 Access Key / Secret Key**

   配置 `QINIU_ACCESS_KEY` 和 `QINIU_SECRET_KEY`。

   ```json
   {
     "mcpServers": {
       "qiniu": {
         "command": "uvx",
         "args": [
           "qiniu-mcp-server"
         ],
         "env": {
           "QINIU_ACCESS_KEY": "YOUR_ACCESS_KEY",
           "QINIU_SECRET_KEY": "YOUR_SECRET_KEY"
         },
         "disabled": false
       }
     }
   }

模式二：使用直播 API Key

在七牛直播控制台获取 API Key 后，配置 QINIU_LIVE_API_KEY。

{
  "mcpServers": {
    "qiniu": {
      "command": "uvx",
      "args": [
        "qiniu-mcp-server"
      ],
      "env": {
        "QINIU_LIVE_API_KEY": "YOUR_LIVE_API_KEY"
      },
      "disabled": false
    }
  }
}