feat: 订单列表支持分页查询，分页大小可选 20/50/100

- /api/orders/my 新增 page/page_size 参数，返回分页信息和全局状态统计
- 用户订单页：分页控件（首/上/下/末页）+ 分页大小选择，摘要卡片改为全局统计
- 管理员订单页：分页大小选择器（20/50/100）+ 首尾页跳转按钮

src/app/api/orders/my/route.ts

@@ -3,28 +3,44 @@ import { prisma } from '@/lib/db';
 import { getCurrentUserByToken } from '@/lib/sub2api/client';
 import { deriveOrderState, isRechargeRetryable } from '@/lib/order/status';
 
+const VALID_PAGE_SIZES = [20, 50, 100];
+
 export async function GET(request: NextRequest) {
-  const token = request.nextUrl.searchParams.get('token')?.trim();
+  const searchParams = request.nextUrl.searchParams;
+  const token = searchParams.get('token')?.trim();
   if (!token) {
     return NextResponse.json({ error: 'token is required' }, { status: 400 });
   }
 
+  const page = Math.max(1, Number(searchParams.get('page') || '1'));
+  const rawPageSize = Number(searchParams.get('page_size') || '20');
+  const pageSize = VALID_PAGE_SIZES.includes(rawPageSize) ? rawPageSize : 20;
+
   try {
     const user = await getCurrentUserByToken(token);
-    const orders = await prisma.order.findMany({
-      where: { userId: user.id },
-      orderBy: { createdAt: 'desc' },
-      take: 20,
-      select: {
-        id: true,
-        amount: true,
-        status: true,
-        paymentType: true,
-        createdAt: true,
-        paidAt: true,
-        completedAt: true,
-      },
-    });
+    const where = { userId: user.id };
+
+    const [orders, total, statusGroups] = await Promise.all([
+      prisma.order.findMany({
+        where,
+        orderBy: { createdAt: 'desc' },
+        skip: (page - 1) * pageSize,
+        take: pageSize,
+        select: {
+          id: true,
+          amount: true,
+          status: true,
+          paymentType: true,
+          createdAt: true,
+          paidAt: true,
+          completedAt: true,
+        },
+      }),
+      prisma.order.count({ where }),
+      prisma.order.groupBy({ by: ['status'], where, _count: true }),
+    ]);
+
+    const sc = Object.fromEntries(statusGroups.map((g) => [g.status, g._count]));
 
     return NextResponse.json({
       user: {
@@ -48,6 +64,15 @@ export async function GET(request: NextRequest) {
           rechargeRetryable: isRechargeRetryable(item),
         };
       }),
+      summary: {
+        total,
+        pending: sc['PENDING'] || 0,
+        completed: (sc['COMPLETED'] || 0) + (sc['PAID'] || 0) + (sc['RECHARGING'] || 0),
+        failed: (sc['FAILED'] || 0) + (sc['CANCELLED'] || 0) + (sc['EXPIRED'] || 0),
+      },
+      page,
+      page_size: pageSize,
+      total_pages: Math.ceil(total / pageSize),
     });
   } catch (error) {
     console.error('Get my orders error:', error);