feat(layout): 添加 SVG 图标系统并更新侧边栏导航

- 引入 Sprite 组件统一管理 SVG 图标
- 创建 Icon 组件支持动态加载图标- 定义 icon-ids 类型确保图标引用安全- 更新 Sidebar 使用新图标组件替换 emoji
- 添加 HomeIcon 和 network 图标资源- 调整侧边栏样式和宽度
- 修复 Header 按钮 title 属性替代 aria-label
- 新增 IP 工具页面路由
- 添加全局阴影变量 --main-border-shadow

package-lock.json

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