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/routes/admin/audit-logs.ts

@@ -1,9 +1,10 @@
 import { Router } from 'express'
+import type { JsonObject } from '../../types/json.js'
 
 import { getAdminAuditLogs } from '../../services/admin/admin-audit-service.js'
 import { createJsonHandler, requireAdminRoles } from './session.js'
 
-type AdminAuditLogRouteQuery = Record<string, any>
+type AdminAuditLogRouteQuery = JsonObject
 
 const router = Router()