接单平台新增拼单与取消接单能力

拼单功能：
- 工单/物品规则支持拼单配置（启用、总数量、单价），总价=单价×数量三方联动，启用拼单时工单金额自动同步拼单总价
- 拼单参与按数量冻结比例押金，验收通过后按份额结算报酬，升级统计按数量计入
- 抢单大厅拼单入口：紫色渐变大按钮带单价展示，拼单进度/剩余份数，弹窗输入数量实时预估报酬与押金
- 我的订单展示拼单份额（数量×单价、状态），拼单者各自提交验收，全部提交后管理员统一验收
- 新增 work_order_shares 表与迁移 008

取消接单：
- 进行中订单可取消（押金全额退还、工单回大厅），30 天内限 5 次防滥用

apps/frontend/src/services/worker.ts

@@ -3,6 +3,7 @@ import type {
   CollectLookupResponse,
   UploadedFile,
   WorkOrder,
+  WorkOrderShare,
   WorkerFinanceRequest,
   WorkerHallOrdersResponse,
   WorkerListResponse,
@@ -107,6 +108,13 @@ export function grabWorkerOrder(workOrderId: number) {
   )
 }
 
+export function joinWorkerSharingOrder(workOrderId: number, payload: { quantity: number }) {
+  return apiPost<{ share: WorkOrderShare }>(
+    `/api/v1/worker/hall/orders/${workOrderId}/join-sharing`,
+    payload,
+  )
+}
+
 export function fetchWorkerMyOrders(params?: Record<string, unknown>) {
   return apiGet<WorkerListResponse<WorkOrder>>('/api/v1/worker/orders', params)
 }
@@ -121,6 +129,12 @@ export function submitWorkerAcceptance(
   )
 }
 
+export function cancelWorkerOrder(workOrderId: number) {
+  return apiPost<{ order: WorkOrder }>(
+    `/api/v1/worker/orders/${workOrderId}/cancel`,
+  )
+}
+
 export function lookupCollectOrder(orderNo: string) {
   return apiPost<CollectLookupResponse>('/api/v1/collect/lookup', { orderNo })
 }