feat: ServerManager 死按钮清理+CSV导出+统计卡片提取; 审批/导航后端拆分; DialogDescription修复; AppRelease重试按钮实现

frontend/src/components/agent/AgentMonitor.tsx

@@ -553,6 +553,7 @@ function HostDetailDialog({
               <Badge className="bg-red-500/15 text-red-400 border border-red-500/30">离线</Badge>
             )}
           </DialogTitle>
+          <DialogDescription className="sr-only">查看主机详情和指标趋势</DialogDescription>
         </DialogHeader>
 
         <div className="space-y-4">