feat(securitySurveillance): 添加视频监控、设备状态和视频管理组件

新增视频监控组件(spjk.vue)支持实时视频展示与布局切换
添加设备状态组件(sbzt.vue)显示设备在线状态和报警信息
实现视频管理组件(spgl.vue)包含存储状态图表和录像设置
引入多个SVG图标资源用于界面交互
优化字体文件格式和样式

public/assets/svg/download.svg

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