feat(classic-games): 新增 Mini Cribbage 小游戏

[wyf027]

新增一个单文件 TailwindCSS 经典小游戏：Mini Cribbage。玩家从 6 张牌中选择组合凑 15，每个新组合获得 2 分，面牌按 10 计。

文件路径：project/classic-games/20260710-1507-cribbage-sum.html

验证结果：

• LIGHT_VALIDATION=pass：确认 HTML 结构、TailwindCSS CDN、核心游戏逻辑和内嵌 JS 语法。
• git diff --check：通过。
• 暂存区确认：仅新增 project/classic-games/20260710-1507-cribbage-sum.html。

审计结果：

• OVERALL_EXIT=0
• AUDIT_DIR=/tmp/git-commit-audit-20260710-151508-42377
• WARN：无

远端提交：cdae11fd537492d8831fe0f0ad4357b57feb03ab

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