接单工单新增流转记录（订单详情时间线）

- 后端：新增工单事件查询接口（管理端 + 打手端），事件带操作人显示名（管理员用户名 / 打手昵称 / 系统）
- 补齐关键节点事件：抢单接手（grabbed）、验收通过（accepted 带操作人）
- 管理端/打手端事件写入操作人（admin session username 贯通至事件）
- 前端：订单详情新增「流转记录」时间线，按订单生命周期节点展示（创建/发单/接手/资料/验收/问题/取消），时间+操作人+状态流转

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

@@ -1056,6 +1056,8 @@ export async function assignWorkOrderToWorker(input: {
   maxActiveOrders: number
   deadlineAt: string | null
   now: string
+  /** 操作人显示名（管理员用户名等） */
+  actorName?: string
 }): Promise<{
   order: WorkOrderRow | null
   failureReason:
@@ -1143,7 +1145,7 @@ export async function assignWorkOrderToWorker(input: {
     await createWorkOrderEventWithClient(client, {
       workOrderId: input.workOrderId,
       actorType: 'admin',
-      actorId: '',
+      actorId: input.actorName || '',
       eventType: 'assigned_by_admin',
       fromStatus,
       toStatus: 'in_progress',
@@ -1245,7 +1247,11 @@ export async function cancelWorkerWorkOrder(input: {
   })
 }
 
-export async function unassignWorkOrder(input: { workOrderId: number; now: string }): Promise<{
+export async function unassignWorkOrder(input: {
+  workOrderId: number
+  now: string
+  actorName?: string
+}): Promise<{
   order: WorkOrderRow | null
   failureReason: 'work_order_not_in_progress' | 'work_order_no_worker' | null
 }> {
@@ -1314,7 +1320,7 @@ export async function unassignWorkOrder(input: { workOrderId: number; now: strin
     await createWorkOrderEventWithClient(client, {
       workOrderId: input.workOrderId,
       actorType: 'admin',
-      actorId: '',
+      actorId: input.actorName || '',
       eventType: 'unassigned_by_admin',
       fromStatus: 'in_progress',
       toStatus: 'unassigned',
@@ -1333,6 +1339,7 @@ export async function returnAssignedWorkOrderToHall(input: {
   workOrderId: number
   now: string
   reason?: string
+  actorName?: string
 }): Promise<{
   order: WorkOrderRow | null
   failureReason: 'work_order_not_in_progress' | 'work_order_no_worker' | null
@@ -1403,7 +1410,7 @@ export async function returnAssignedWorkOrderToHall(input: {
     await createWorkOrderEventWithClient(client, {
       workOrderId: input.workOrderId,
       actorType: 'admin',
-      actorId: '',
+      actorId: input.actorName || '',
       eventType: 'returned_to_hall_by_admin',
       fromStatus: 'in_progress',
       toStatus: 'open',
@@ -1426,6 +1433,7 @@ export async function cancelAssignedWorkOrder(input: {
   workOrderId: number
   now: string
   reason?: string
+  actorName?: string
 }): Promise<{
   order: WorkOrderRow | null
   failureReason: 'work_order_not_in_progress' | 'work_order_no_worker' | null
@@ -1496,7 +1504,7 @@ export async function cancelAssignedWorkOrder(input: {
     await createWorkOrderEventWithClient(client, {
       workOrderId: input.workOrderId,
       actorType: 'admin',
-      actorId: '',
+      actorId: input.actorName || '',
       eventType: 'cancelled_by_admin',
       fromStatus: 'in_progress',
       toStatus: 'cancelled',
@@ -1537,6 +1545,10 @@ export async function acceptWorkOrderAndSettle(input: {
   workOrderId: number
   unfreezeDays: number
   now: string
+  /** 操作人类型：admin / worker / system */
+  actorType?: string
+  /** 操作人显示名 */
+  actorName?: string
 }): Promise<{
   order: WorkOrderRow | null
   failureReason: 'sharing_pending_submissions' | null
@@ -1809,8 +1821,8 @@ export async function acceptWorkOrderAndSettle(input: {
 
     await createWorkOrderEventWithClient(client, {
       workOrderId: input.workOrderId,
-      actorType: 'admin',
-      actorId: '',
+      actorType: input.actorType || 'admin',
+      actorId: input.actorName || '',
       eventType: 'accepted',
       fromStatus: 'pending_acceptance',
       toStatus: 'accepted',
@@ -1834,6 +1846,7 @@ export async function resolveProblemWorkOrder(input: {
   action: ProblemWorkOrderResolutionAction
   note: string
   now: string
+  actorName?: string
 }): Promise<WorkOrderRow | null> {
   return withTransaction(async (client) => {
     const currentResult = await client.query<WorkOrderRow>(
@@ -1937,7 +1950,7 @@ export async function resolveProblemWorkOrder(input: {
     await createWorkOrderEventWithClient(client, {
       workOrderId: input.workOrderId,
       actorType: 'admin',
-      actorId: '',
+      actorId: input.actorName || '',
       eventType: `problem_${input.action}`,
       fromStatus: 'problem',
       toStatus: targetStatus,
@@ -2409,6 +2422,33 @@ export async function countWorkerTimeoutEvents(workerId: number | string): Promi
   return counts.get(Number(workerId)) || 0
 }
 
+export type WorkOrderEventRow = {
+  id: number
+  work_order_id: number
+  actor_type: string
+  actor_id: string
+  event_type: string
+  from_status: string
+  to_status: string
+  payload_json: string | Record<string, unknown>
+  created_at: string
+}
+
+export async function listWorkOrderEventsByOrderId(
+  workOrderId: number | string,
+): Promise<WorkOrderEventRow[]> {
+  const result = await query<WorkOrderEventRow>(
+    `
+      SELECT *
+      FROM work_order_events
+      WHERE work_order_id = $1
+      ORDER BY id ASC
+    `,
+    [Number(workOrderId)],
+  )
+  return result.rows
+}
+
 export async function createWorkOrderEvent(input: {
   workOrderId: number
   actorType: string