test(chat): 修复测试文件Mock配置

范围: src/business/chat/
涉及文件:
- chat.module.spec.ts
- chat.service.spec.ts

主要改进:
- 添加缺失的ZulipAccountsService Mock配置
- 修复handlePlayerLogout测试，删除过时的deleteApiKey断言
- 删除不再需要的API Key清理失败测试用例
- 添加getUserClient Mock方法
- 设置默认Mock行为，提高测试稳定性

src/business/chat/chat.module.spec.ts

@@ -7,9 +7,12 @@
  * - 接口导出验证
  * 
  * @author moyin
- * @version 1.0.0
+ * @version 1.0.1
  * @since 2026-01-14
- * @lastModified 2026-01-14
+ * @lastModified 2026-01-19
+ * 
+ * 修改记录：
+ * - 2026-01-19 moyin: Bug修复 - 添加缺失的ZulipAccountsService Mock配置
  */
 
 import { Test, TestingModule } from '@nestjs/testing';
@@ -33,6 +36,7 @@ describe('ChatModule', () => {
     createUserClient: jest.fn(),
     destroyUserClient: jest.fn(),
     sendMessage: jest.fn(),
+    getUserClient: jest.fn(),
   };
 
   const mockZulipConfigService = {
@@ -61,6 +65,10 @@ describe('ChatModule', () => {
     verifyToken: jest.fn(),
   };
 
+  const mockZulipAccountsService = {
+    findByGameUserId: jest.fn(),
+  };
+
   beforeEach(async () => {
     // 禁用日志输出
     jest.spyOn(Logger.prototype, 'log').mockImplementation();
@@ -97,6 +105,10 @@ describe('ChatModule', () => {
           provide: LoginCoreService,
           useValue: mockLoginCoreService,
         },
+        {
+          provide: 'ZulipAccountsService',
+          useValue: mockZulipAccountsService,
+        },
       ],
     }).compile();