feat: 隐藏最近更新模块并统一链接样式

[discreted66]

• 注释 UpdateSection，暂停 GitHub API 调用

• category-link 和 component-link 统一为灰色风格，hover 显示下划线

• 暗色模式下链接使用 #cccccc / rgba(255,255,255,0.08)

• 移除 product-cards-grid 多余的 padding-bottom

[coderabbitai]

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