feat: 添加图标和路由配置

- 新增多个 SVG 图标文件
- 添加 `/demo/icons` 路由配置，用于图标预览

src/assets/svg/xt-finalCut.svg

@@ -0,0 +1,4 @@
+<svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path fill-rule="evenodd" clip-rule="evenodd" d="M10.5283 9.11816C10.8534 8.94427 11.2479 8.96345 11.5547 9.16797L14.5547 11.168C14.8329 11.3534 15 11.6657 15 12C15 12.3343 14.8329 12.6466 14.5547 12.832L11.5547 14.832C11.2479 15.0366 10.8534 15.0557 10.5283 14.8818C10.2032 14.7078 10 14.3688 10 14V10L10.0098 9.86328C10.0531 9.54904 10.2439 9.2704 10.5283 9.11816ZM12 12.1309L12.1973 12L12 11.8682V12.1309Z" fill="currentColor"/>
+<path fill-rule="evenodd" clip-rule="evenodd" d="M18.5 2.5C19.0523 2.5 19.5 2.94772 19.5 3.5V4.5H22C22.5523 4.5 23 4.94772 23 5.5V18.5C23 19.0523 22.5523 19.5 22 19.5H19.5V20.5C19.5 21.0523 19.0523 21.5 18.5 21.5H5.5C4.94772 21.5 4.5 21.0523 4.5 20.5V19.5H2C1.44772 19.5 1 19.0523 1 18.5V5.5C1 4.94772 1.44772 4.5 2 4.5H4.5V3.5C4.5 2.94772 4.94772 2.5 5.5 2.5H18.5ZM6.5 19.5H17.5V4.5H6.5V19.5ZM3 17.5H4.5V6.5H3V17.5ZM19.5 17.5H21V6.5H19.5V17.5Z" fill="currentColor"/>
+</svg>