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/repositories/kuaishou-cloud-task-state-repo.ts

@@ -3,10 +3,9 @@ import { TASK_STATUS } from '../domain/task-status.js'
 import { maskCode } from '../utils/masking.js'
 import { parseTaskContext } from '../utils/task-json.js'
 import { normalizeTimestampIso } from '../utils/time.js'
+import type { JsonObject, JsonRecord } from '../types/json.js'
 
 type QueryExecutor = (text: string, params?: unknown[]) => Promise<{ rows: unknown[] }>
-type JsonRecord = Record<string, any>
-
 export type KuaishouCloudSourceLoadStat = {
   sourceKey: string
   activeCount: number