feat:拼单明细管理加一个撤份额的功能，指定数量

apps/backend/src/routes/admin/worker-platform/acceptance.ts

@@ -8,6 +8,7 @@ import {
   deductAdminWorkOrderPendingDeposit,
   markAdminWorkOrderProblem,
   markAdminWorkOrderShareProblem,
+  reduceAdminWorkOrderShareQuantity,
   resolveAdminProblemWorkOrder,
   disposeAdminWorkOrderShareProblem,
 } from '../../../services/worker-platform/index.js'
@@ -163,6 +164,32 @@ router.post(
   ),
 )
 
+// 按份数撤销部分份额：减少的份数自动回到大厅，押金保持原冻结额。
+router.post(
+  '/worker-platform/orders/:workOrderId/shares/:shareId/reduce-quantity',
+  requireAdminPermission('worker_order.cancel_share'),
+  createJsonHandler(
+    (req) =>
+      reduceAdminWorkOrderShareQuantity(
+        String(req.params.workOrderId || ''),
+        String(req.params.shareId || ''),
+        req.body || {},
+        req.adminSession?.displayName || req.adminSession?.username || '',
+      ),
+    {
+      successMessage: '已撤销指定份数，剩余份数继续履约',
+      errorMessage: '撤销拼单份额失败',
+      scope: '[admin/worker-platform/orders/:workOrderId/shares/:shareId/reduce-quantity]',
+      audit: (req, data) => ({
+        action: 'work_order_share_quantity_reduced',
+        targetType: 'work_order_share',
+        targetId: String(req.params.shareId || ''),
+        data: data && typeof data === 'object' ? (data as Record<string, unknown>) : {},
+      }),
+    },
+  ),
+)
+
 // 份额级问题单：只影响该份额持有人，母单状态不变。
 router.post(
   '/worker-platform/orders/:workOrderId/shares/:shareId/problem',