feat: 添加Font Awesome字体图标及相关样式文件

新增Font Awesome的字体文件、SVG图标及LESS/SCSS样式文件，包括基础样式、图标定义和响应式布局支持。添加了多种常用图标如播放、停止、加减乘除等，并支持列表布局和屏幕阅读器优化。

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