feat(analytics): Add 51LA Analytics Component Support

[jacksen168sub]

Type of change

• Bug fix (a non-breaking change that fixes an issue)
• New feature (a non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other (please describe):

Checklist

• I have read the CONTRIBUTING document.
• I have checked to ensure that this Pull Request is not for personal changes.
• I have performed a self-review of my own code.
• My changes generate no new warnings.

Related Issue

Changes

新增 51la 网站统计支持，与现有的 Google Analytics 和 Microsoft Clarity 保持一致的代码风格。

修改文件：

文件	改动
src/types/config.ts	添加 51la 配置类型定义
src/config/siteConfig.ts	添加 51la 配置项
src/components/analytics/La51Analytics.astro	新建 51la 统计组件
src/layouts/Layout.astro	集成 51la 组件

配置选项：

analytics: {
  la51AnalyticsId: "YOUR_ID",
  la51Config: {
    sdkUrl: "",       // 自定义 SDK 地址，防止 DNS 污染
    ck: "",           // 多统计 ID 数据分离标识
    autoTrack: true,  // 事件分析功能
    hashMode: false,  // SPA 路由支持（MPA 站点无需开启）
    screenRecord: true, // 录屏功能
  },
},

How To Test

1. 在 src/config/siteConfig.ts 中填写 la51AnalyticsId
2. 运行 pnpm build 构建项目
3. 部署后访问网站，检查 51la 后台是否正常接收数据

Screenshots (if applicable)

Additional Notes

• 使用异步加载方式，不阻塞页面渲染
• 使用 is:inline + data-swup-ignore-script 属性，与 Swup 页面切换兼容
• 支持自定义 SDK 地址，防止 DNS 污染导致加载恶意 JS

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