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/scheduler/cloudtentacles-health-job.ts

@@ -1,4 +1,5 @@
 import { getCloudtentaclesAsset } from '../platforms/cloudtentacles/catalog-service.js'
+import type { JsonObject } from '../../types/json.js'
 import {
   normalizeCloudtentaclesDeviceId,
   normalizeCloudtentaclesDeviceType,
@@ -13,7 +14,6 @@ import {
   notifyCloudtentaclesAuthExpired,
 } from '../notification/domain-notifications.js'
 
-type JsonObject = Record<string, any>
 type CloudtentaclesHealthAccountResult = {
   sourceKey: string
   label: string