add:新增同一个工单同一人可以多次拼单：拼单后台撤单，不影响母单状态

apps/backend/src/repositories/worker-platform/work-order-settlement-repo.ts

@@ -709,7 +709,13 @@ export async function acceptWorkOrderShareAndSettle(input: {
   })
 }
 
-/** 后台撤销单个拼单份额，释放该打手押金并把份数重新放回大厅。 */
+/**
+ * 后台撤销单个拼单份额：退还该打手押金、释放这一份的占用。
+ *
+ * **不改母工单状态**：后台撤单常用于剔除错误参与者/纠错，撤掉一份不应把
+ * 待验收（或进行中）的母单踢回大厅；需要改母单状态时走「拼单撤单」的
+ * 退回大厅/取消整单显式操作。
+ */
 export async function cancelWorkOrderShare(input: {
   workOrderId: number
   shareId: number
@@ -819,19 +825,16 @@ export async function cancelWorkOrderShare(input: {
        WHERE id = $2`,
       [input.now, input.shareId],
     )
-    // 母单状态由剩余份额集合推导：撤掉这一份后，其余已提交份额仍可正常待验收
-    const recomputedOrder = await recomputeWorkOrderSharingStatusWithClient(
-      client,
-      input.workOrderId,
-      input.now,
-    )
+    // 母单状态保持不变：这里只取消这一份份额，不再按剩余份额重推母单状态。
+    // （旧实现会 recompute：待验收的母单撤掉一份后 allocated < total → 变回 open，
+    //  等于整单被踢回抢单大厅，与「后台撤单只影响该份额」的预期不符。）
     await createWorkOrderEventWithClient(client, {
       workOrderId: input.workOrderId,
       actorType: 'admin',
       actorId: input.actorName || '',
       eventType: 'sharing_share_cancelled_by_admin',
       fromStatus: workOrder.status,
-      toStatus: recomputedOrder?.status || workOrder.status,
+      toStatus: workOrder.status,
       payloadJson: JSON.stringify({
         shareId: input.shareId,
         workerId,

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

@@ -148,7 +148,7 @@ router.post(
         req.adminSession?.displayName || req.adminSession?.username || '',
       ),
     {
-      successMessage: '拼单参与者已撤单，份数已退回大厅',
+      successMessage: '拼单参与者已撤单，押金已退还，母单状态保持不变',
       errorMessage: '撤销拼单参与者失败',
       scope: '[admin/worker-platform/orders/:workOrderId/shares/:shareId/cancel]',
       audit: (req, data) => ({

apps/backend/src/services/worker-platform/worker-platform-service.test.ts

@@ -3302,33 +3302,39 @@ test('拼单母单已验收或已取消时 recompute 不回头改状态', async
   }
 })
 
-test('份额超时/撤单只改份额本身，母单状态统一交给 recompute', () => {
+test('后台单人撤单不改母单状态；份额超时仍交给 recompute 收敛', async () => {
   const src = fs.readFileSync(
     new URL('../../repositories/worker-platform/work-order-settlement-repo.ts', import.meta.url),
     'utf8',
   )
-  const blocks = [
-    [
-      'export async function cancelWorkOrderShare(',
-      'export async function settleOverdueWorkOrderShare(',
-    ],
-    [
-      'export async function settleOverdueWorkOrderShare(',
-      'export async function cancelWorkOrderSharing(',
-    ],
-  ]
-  for (const [start, end] of blocks) {
-    const block = src.slice(src.indexOf(start!), src.indexOf(end!))
-    assert.ok(block.length > 0, `${start} 片段必须存在`)
-    assert.ok(
-      block.includes('recomputeWorkOrderSharingStatusWithClient('),
-      `${start} 必须用 recompute 收敛母单状态`,
-    )
-    assert.ok(
-      !/UPDATE\s+work_orders\s+SET[\s\S]{0,80}?status\s*=/i.test(block),
-      `${start} 不得自己写母单 status（只能由 recompute 推导）`,
-    )
-  }
+  const cancelBlock = src.slice(
+    src.indexOf('export async function cancelWorkOrderShare('),
+    src.indexOf('export async function settleOverdueWorkOrderShare('),
+  )
+  assert.ok(cancelBlock.length > 0, 'cancelWorkOrderShare 片段必须存在')
+  assert.ok(
+    !cancelBlock.includes('recomputeWorkOrderSharingStatusWithClient('),
+    '后台单人撤单不得重算母单状态（撤一份会把待验收的母单踢回大厅）',
+  )
+  assert.ok(
+    !/UPDATE\s+work_orders\s+SET[\s\S]{0,80}?status\s*=/i.test(cancelBlock),
+    '后台单人撤单不得自己写母单 status',
+  )
+  assert.ok(cancelBlock.includes('toStatus: workOrder.status'), '撤单事件不得记录母单状态迁移')
+
+  const timeoutBlock = src.slice(
+    src.indexOf('export async function settleOverdueWorkOrderShare('),
+    src.indexOf('export async function cancelWorkOrderSharing('),
+  )
+  assert.ok(timeoutBlock.length > 0, 'settleOverdueWorkOrderShare 片段必须存在')
+  assert.ok(
+    timeoutBlock.includes('recomputeWorkOrderSharingStatusWithClient('),
+    '份额超时必须用 recompute 收敛母单状态',
+  )
+  assert.ok(
+    !/UPDATE\s+work_orders\s+SET[\s\S]{0,80}?status\s*=/i.test(timeoutBlock),
+    '份额超时不得自己写母单 status（只能由 recompute 推导）',
+  )
 })
 
 test('拼单每次参与都新增一条份额，并按 requestId 幂等、按参与时间固化截止时间', () => {

apps/frontend/src/pages/admin/panels/WorkOrdersPanel.tsx

@@ -700,7 +700,7 @@ export default function WorkOrdersPanel() {
         cancelAdminWorkOrderShare(workOrderId, cancelShare.shareId, {
           reason: String(values.reason || '').trim(),
         }),
-      '该参与者已撤单，押金和拼单份数已恢复',
+      '该参与者已撤单，押金已退还，母单状态未变更',
     )
     if (!succeeded) return
     await queryClient.invalidateQueries({
@@ -3305,7 +3305,7 @@ export default function WorkOrdersPanel() {
               showIcon
               type="warning"
               message={`将撤销该打手承接的 ${cancelShare.quantity} 份拼单`}
-              description="撤单后会退还该份额冻结的押金，空出的份数重新回到接单大厅；已提交的验收资料会保留在后台记录中。"
+              description="撤单只释放这一份份额并退还该份额冻结的押金，母单状态保持不变（待验收/进行中的单不会被踢回大厅）；已提交的验收资料会保留在后台记录中。"
               style={{ marginBottom: 16 }}
             />
             <Form.Item label="撤单原因" name="reason">