feat: Dashboard 合同卡片显示有效合同数 + 总合同数

frontend/src/pages/platform/PlatformDashboard.tsx

@@ -11,6 +11,7 @@ interface DashboardData {
   totalUsers: number
   totalEmployees: number
   totalContracts: number
+  activeContracts: number
   totalPayslips: number
   orgsByPlan: { plan: string; count: number }[]
   recentOrgs: {
@@ -38,7 +39,7 @@ export default function PlatformDashboard() {
     { label: '企业总数', value: data.totalOrgs, icon: Building2, color: 'text-primary' },
     { label: '用户总数', value: data.totalUsers, icon: Users, color: 'text-blue-600' },
     { label: '员工总数', value: data.totalEmployees, icon: Users, color: 'text-emerald-600' },
-    { label: '合同总数', value: data.totalContracts, icon: FileText, color: 'text-purple-600' },
+    { label: '有效合同', value: data.activeContracts, sub: `共 ${data.totalContracts} 份`, icon: FileText, color: 'text-purple-600' },
     { label: '工资条总数', value: data.totalPayslips, icon: Calculator, color: 'text-rose-600' },
   ]
 
@@ -60,6 +61,7 @@ export default function PlatformDashboard() {
                 <Icon className={`w-5 h-5 ${s.color}`} />
               </div>
               <div className="text-2xl font-bold text-gray-900">{s.value.toLocaleString()}</div>
+              {(s as any).sub && <div className="text-xs text-gray-400 mt-0.5">{(s as any).sub}</div>}
             </div>
           )
         })}