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/fulfillment/kuaishou-feifei/index.ts

@@ -8,6 +8,7 @@ import { parseTaskContext } from '../../../utils/task-json.js'
 import { nowIso } from '../../../utils/time.js'
 import { TASK_STATUS } from '../../../domain/task-status.js'
 import { appendUidToUrl, getClaimIdentityFromContext } from '../../claim/claim-identity.js'
+import type { JsonObject } from '../../../types/json.js'
 import {
   createKuaishouFeifeiOrder,
   queryKuaishouFeifeiOrder,
@@ -17,8 +18,6 @@ import { buildKuaishouIndustryVoucherContext } from '../../platforms/kuaishou-in
 import { normalizeShortLinkPayload } from '../../short-links/short-link-service.js'
 import type { TaskRow } from '../../../types/repository/rows.js'
 
-type JsonObject = Record<string, any>
-
 export function isKuaishouFeifeiTask(task: Partial<TaskRow> | null | undefined) {
   return String(task?.executor_key || '').trim() === 'kuaishou_feifei'
 }