fix: Gate E2E — override AdminAuthGuard with mock to resolve Reflector dependency

Test.createTestingModule 不会将 Reflector 传播到子模块 AppConfigModule。
用 overrideGuard(MockAdminAuthGuard) 绕过 AdminAuthGuard 的 Reflector 依赖。

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

test/m-ai-03-gate.e2e-spec.ts

@@ -1,9 +1,14 @@
 import { Test, TestingModule } from '@nestjs/testing';
-import { INestApplication } from '@nestjs/common';
-import { Reflector } from '@nestjs/core';
+import { INestApplication, Injectable, CanActivate, ExecutionContext } from '@nestjs/common';
 import { JwtService } from '@nestjs/jwt';
 import request from 'supertest';
 import { AppModule } from '../src/app.module';
+
+// Mock AdminAuthGuard — Test.createTestingModule 不提供 Reflector 给子模块
+@Injectable()
+class MockAdminAuthGuard implements CanActivate {
+  canActivate(_context: ExecutionContext): boolean { return true; }
+}
 import { AiJobCreationService } from '../src/modules/ai-job/ai-job-creation.service';
 import { JobDefinitionRegistry } from '../src/modules/ai-job/job-definition-registry';
 import { AiJobLifecycleRepository } from '../src/modules/ai-job/ai-job-lifecycle.repository';
@@ -44,8 +49,10 @@ describe('M-AI-03 GATE E2E (fail-closed)', () => {
     // AppModule.init() 连接 Prisma + Redis — 失败则测试 fail-closed
     const module: TestingModule = await Test.createTestingModule({
       imports: [AppModule],
-      providers: [Reflector],
-    }).compile();
+    })
+    .overrideGuard(require('../src/common/guards/admin-auth.guard').AdminAuthGuard)
+    .useClass(MockAdminAuthGuard)
+    .compile();
 
     app = module.createNestApplication();
     app.setGlobalPrefix('api', { exclude: ['admin-api/(.*)', 'internal/(.*)'] });