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/utils/logger.ts

@@ -6,6 +6,7 @@ import util from 'node:util'
 import { PROJECT_ROOT, runtimeConfig } from '../config/runtime.js'
 import type { HttpErrorLike } from './http.js'
 import { maskSecret } from './masking.js'
+import { asJsonObject } from '../types/json.js'
 
 type LogLevel = 'debug' | 'info' | 'warn' | 'error'
 type LogChannel = 'app' | 'integration'
@@ -362,7 +363,7 @@ function isSensitiveLogKey(key: unknown): boolean {
 function normalizeExternalHttpPacketDetail(
   detail: ExternalHttpPacketDetail,
 ): ExternalHttpPacketDetail {
-  const source = detail && typeof detail === 'object' && !Array.isArray(detail) ? detail : {}
+  const source = asJsonObject(detail)
   const normalized: ExternalHttpPacketDetail = {}
 
   for (const [key, value] of Object.entries(source)) {