refactor: ALLOWED_CREDENTIAL_MODES 集中到 job-definition.types.ts

消除 Registry 中的重复运行时数组，改为从 types 文件导入。
类型定义与运行时数组同源，避免异步风险。

Co-Authored-By: Claude <noreply@anthropic.com>

src/modules/ai-job/job-definition-registry.ts

@@ -2,7 +2,7 @@ import { Injectable, Logger, OnModuleInit } from '@nestjs/common';
 import {
   JobDefinition,
   ALLOWED_QUEUE_NAMES,
-  AllowedCredentialMode,
+  ALLOWED_CREDENTIAL_MODES,
 } from './job-definition.types';
 
 // ── Registry 专用错误 ──
@@ -265,11 +265,7 @@ export class JobDefinitionRegistry implements OnModuleInit {
       throw new MissingBackoffError(def.jobType);
     }
 
-    // credential: allowedModes 非空且值合法
+    // credential: allowedModes 非空且值合法（校验数组引用自 job-definition.types.ts）
-    const ALLOWED_CREDENTIAL_MODES: readonly string[] = [
-      'platform_key',
-      'user_deepseek_key',
-    ];
     if (
       !def.credential.allowedModes ||
       def.credential.allowedModes.length === 0

src/modules/ai-job/job-definition.types.ts

@@ -9,7 +9,12 @@ export const ALLOWED_QUEUE_NAMES = ['ai-interactive', 'ai-background'] as const;
 export type AllowedQueueName = (typeof ALLOWED_QUEUE_NAMES)[number];
 
 /** 允许的凭据模式 */
-export type AllowedCredentialMode = 'platform_key' | 'user_deepseek_key';
+export const ALLOWED_CREDENTIAL_MODES = [
+  'platform_key',
+  'user_deepseek_key',
+] as const;
+
+export type AllowedCredentialMode = (typeof ALLOWED_CREDENTIAL_MODES)[number];
 
 export interface JobDefinition {
   /** 全局唯一 jobType，与 AiJob.jobType 对应。必须匹配 /^[a-z][a-z0-9_]{1,63}$/ */