收紧后端 TypeScript：统一 Json 类型与 TaskContext 契约

关闭 allowJs；集中 JsonObject 定义并替换分散 any 别名；parseTaskContext 返回 TaskContext；任务详情 API 标注 AdminTaskDetailView；测试减少 as any。

apps/backend/src/services/admin/admin-read-service.ts

@@ -5,6 +5,7 @@ import { listOrderItemsByOrderId } from '../../repositories/order-item-repo.js'
 import { getOrderById, listOrders } from '../../repositories/order-repo.js'
 import { getTaskById, listTasks, listTasksByOrderId } from '../../repositories/task-repo.js'
 import { listTaskEventsByTaskId } from '../../repositories/task-event-repo.js'
+import type { JsonObject, JsonRecord } from '../../types/json.js'
 import {
   listKuaishouIndustryVouchersByOid,
   listKuaishouIndustryVouchersByTaskId,
@@ -58,6 +59,7 @@ import type {
   AdminOrderListResponse,
   AdminTaskListResponse,
 } from '../../types/admin/read-models.js'
+import type { AdminTaskDetailView } from '../../types/admin/task-detail.js'
 import type {
   AdminEntityIdInput,
   AdminOrderListQueryInput,
@@ -69,8 +71,6 @@ import type {
   TaskRow,
 } from '../../types/repository/rows.js'
 
-type JsonRecord = Record<string, any>
-
 export async function getAdminOrders(
   query: AdminOrderListQueryInput = {},
 ): Promise<AdminOrderListResponse> {
@@ -218,7 +218,7 @@ export async function getAdminTasks(
 export async function getAdminTaskDetail(
   taskId: AdminEntityIdInput,
   session: AdminViewerSessionInput | null = null,
-): Promise<JsonRecord> {
+): Promise<AdminTaskDetailView> {
   const task = await getTaskById(Number(taskId))
 
   if (!task) {