feat: 打手分内部/外部，内部免审核；支持后台指派打手

- worker_users 新增 worker_type（internal/external，迁移 017）
- 内部打手提交验收后自动通过进入待打款（accepted+结算），外部打手保持后台审核
- 打手管理页支持设为内部/外部并显示类型标签
- 新增后台指派打手：未分配/待抢单工单可指定已注册打手，进入其我的订单并冻结押金
- 指派带审计与事件记录，校验打手状态/接单上限/余额押金

apps/frontend/src/services/admin/worker-platform.ts

@@ -124,7 +124,7 @@ export function deleteAdminWorkProductRule(ruleId: number) {
 
 export function reviewAdminWorkerUser(
   workerId: number,
-  payload: { status: string; reviewNote?: string; levelId?: number },
+  payload: { status: string; reviewNote?: string; levelId?: number; workerType?: string },
 ) {
   return apiPost<{ worker: WorkerUser }>(
     `/api/v1/admin/worker-platform/workers/${workerId}/review`,
@@ -132,6 +132,16 @@ export function reviewAdminWorkerUser(
   )
 }
 
+export function assignAdminWorkOrderToWorker(
+  workOrderId: number,
+  payload: { workerId: number },
+) {
+  return apiPost<{ order: WorkOrder }>(
+    `/api/v1/admin/worker-platform/orders/${workOrderId}/assign`,
+    payload,
+  )
+}
+
 export function creditAdminWorkerWallet(
   workerId: number,
   payload: { amount: number; note?: string },