Wrap Guandan team rows for mobile scoreboard layout

[TypeThe0ry]

Motivation

• 修复掼蛋计分板在移动端未生效的问题，使现有面向 .guandan-teams 的媒体查询在两个断点（768px / 480px）均能正确应用。

Description

• 在 static/index.html 中为原本直接 v-for 渲染的 .guandan-team-row 添加了外层包装 <div class="guandan-teams">，并保留每个 .guandan-team-row 上的 v-for 与现有结构以保持渲染不变。

Testing

• 运行 npm test 时失败，因为仓库的 package.json 中没有定义 test 脚本，无法执行自动化测试。

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Codex Task

[Copilot]

Pull request overview

This PR fixes the Guandan mobile scoreboard layout by adding the missing .guandan-teams wrapper so the existing responsive CSS (768px / 480px breakpoints) can correctly target and lay out team rows.

Changes:

• Wrapped the v-for rendered .guandan-team-row elements in a new <div class="guandan-teams"> container in static/index.html.
• Preserved the existing v-for and per-row structure to avoid changing rendered team-row content, while enabling the intended media-query grid layout.

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