feat: 定时任务编辑入口全栈打通 + 修复ApprovalFlow编译错误 + 完成大文件拆分重构

- CronJobManager: 编辑按钮接通 onClick → openEdit(job)，弹出编辑对话框预填数据，
  复用新建/编辑共用 Dialog（editingId 区分模式），标题/按钮文案动态切换，
  保存时根据 editingId 调用 createJob 或 updateJob — 消除占位按钮
- ApprovalFlow: 修复 API 方法名不匹配导致 tsc -b 编译失败
  (getInstances→getProcesses, getMyApprovals→getProcesses({status:'pending'}),
   approveInstance→approveProcess, rejectInstance→rejectProcess)
  + 添加 ApprovalFlowManager 导出别名兼容 App.tsx 导入
- 合并已完成的大文件拆分重构: automation.go→automation_cron/script/playbook,
  ldap.go→ldap_ou/ldap_users, server.go→cloud_accounts/domain/platform/region,
  user.go→user_admin; 前端 Dashboard/K8s/Server/Approval/Monitor 子组件拆分
  // Logan.Li

frontend/src/components/dashboard/DashboardStats.tsx

@@ -0,0 +1,70 @@
+import { Card, CardContent } from '@/components/ui/card';
+import { TrendingUp, TrendingDown } from 'lucide-react';
+
+// 统计卡片组件
+export function StatCard({
+  title,
+  value,
+  description,
+  icon: Icon,
+  trend,
+  trendValue,
+  color,
+  onClick,
+}: {
+  title: string;
+  value: string | number;
+  description?: string;
+  icon: React.ElementType;
+  trend?: 'up' | 'down' | 'neutral';
+  trendValue?: string;
+  color: string;
+  onClick?: () => void;
+}) {
+  const colorClasses: Record<string, { bg: string; text: string }> = {
+    blue: { bg: 'bg-blue-500/10', text: 'text-blue-400' },
+    emerald: { bg: 'bg-emerald-500/10', text: 'text-emerald-400' },
+    amber: { bg: 'bg-amber-500/10', text: 'text-amber-400' },
+    rose: { bg: 'bg-rose-500/10', text: 'text-rose-400' },
+    purple: { bg: 'bg-purple-500/10', text: 'text-purple-400' },
+    cyan: { bg: 'bg-cyan-500/10', text: 'text-cyan-400' },
+    orange: { bg: 'bg-orange-500/10', text: 'text-orange-400' },
+  };
+  const colors = colorClasses[color];
+
+  return (
+    <Card
+      className="bg-slate-900 border-slate-800 hover:border-slate-700 transition-all cursor-pointer"
+      onClick={onClick}
+    >
+      <CardContent className="p-6">
+        <div className="flex items-start justify-between">
+          <div className="space-y-2">
+            <p className="text-sm font-medium text-slate-400">{title}</p>
+            <div className="flex items-baseline gap-2">
+              <h3 className="text-2xl font-bold text-slate-100">{value}</h3>
+              {trend && trendValue && (
+                <span
+                  className={`flex items-center text-xs font-medium ${
+                    trend === 'up' ? 'text-emerald-400' : trend === 'down' ? 'text-red-400' : 'text-slate-400'
+                  }`}
+                >
+                  {trend === 'up' ? (
+                    <TrendingUp className="h-3 w-3 mr-0.5" />
+                  ) : trend === 'down' ? (
+                    <TrendingDown className="h-3 w-3 mr-0.5" />
+                  ) : null}
+                  {trendValue}
+                </span>
+              )}
+            </div>
+            {description && <p className="text-xs text-slate-500">{description}</p>}
+          </div>
+          <div className={`p-3 rounded-lg ${colors.bg} ${colors.text}`}>
+            <Icon className="h-5 w-5" />
+          </div>
+        </div>
+      </CardContent>
+    </Card>
+  );
+}