Show aftersales stats and recent orders on dashboard

- Adds a second row of cards (total / pending / closed / rejected)
- New "最近售后工单" table linking to detail pages
- DashboardStats type extended; dashboardApi maps backend overview

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/services/api.ts

@@ -212,6 +212,10 @@ export const dashboardApi = {
         totalEmployeeSerials: data.overview?.totalEmployeeSerials || 0,
         activeSerials: data.overview?.activeSerials || 0,
         inactiveSerials: data.overview?.inactiveSerials || 0,
+        totalAftersales: data.overview?.totalAftersales || 0,
+        pendingConfirmation: data.overview?.pendingConfirmation || 0,
+        closedAftersales: data.overview?.closedAftersales || 0,
+        rejectedAftersales: data.overview?.rejectedAftersales || 0,
         monthlyData: data.monthlyStats || [],
         recentCompanies: data.recentCompanies?.map((c: any) => ({
           id: c.companyName,
@@ -227,6 +231,7 @@ export const dashboardApi = {
           createdAt: s.createdAt,
           type: s.type,
         })) || [],
+        recentAftersales: data.recentAftersales || [],
       };
     }
     throw new Error('获取统计数据失败');