debug: 添加DouyinAuthClient依赖注入调试信息和错误处理

- 在DouyinContentAdapter构造函数中添加调试日志
- 在getAccessToken方法中添加详细的错误检查和处理
- 将DouyinAuthClient添加到module的exports中
- 提供更详细的错误信息帮助诊断注入问题

src/content-moderation/adapters/douyin-content.adapter.ts

@@ -36,6 +36,13 @@ export class DouyinContentAdapter extends BaseContentAdapter {
   ) {
     super(httpService, configService, auditLogRepository);
 
+    // 调试：检查 douyinAuthClient 是否正确注入
+    console.log('DouyinContentAdapter constructor - douyinAuthClient:', this.douyinAuthClient);
+    console.log('douyinAuthClient type:', typeof this.douyinAuthClient);
+    if (this.douyinAuthClient) {
+      console.log('douyinAuthClient.getAccessToken type:', typeof this.douyinAuthClient.getAccessToken);
+    }
+
     // 抖音开放平台配置：clientKey/clientSecret 实际使用的是 APP_ID/APP_SECRET
     this.douyinConfig = {
       clientKey: this.configService.get('BYTEDANCE_APP_ID') || '',
@@ -157,6 +164,17 @@ export class DouyinContentAdapter extends BaseContentAdapter {
    * 获取访问令牌
    */
   private async getAccessToken(): Promise<string> {
+    console.log('getAccessToken called - douyinAuthClient:', this.douyinAuthClient);
+    console.log('douyinAuthClient type:', typeof this.douyinAuthClient);
+    
+    if (!this.douyinAuthClient) {
+      throw new Error('DouyinAuthClient 未正确注入');
+    }
+    
+    if (typeof this.douyinAuthClient.getAccessToken !== 'function') {
+      throw new Error(`DouyinAuthClient.getAccessToken 不是函数，类型: ${typeof this.douyinAuthClient.getAccessToken}`);
+    }
+    
     return this.douyinAuthClient.getAccessToken().then(res => res.accessToken)
   }
 

src/content-moderation/content-moderation.module.ts

@@ -51,6 +51,6 @@ import { ContentAuditGuard } from './guards/content-audit.guard';
     ContentAuditGuard,
   ],
   controllers: [ContentModerationController],
-  exports: [UnifiedContentService, ContentAdapterFactory, ContentAuditGuard],
+  exports: [UnifiedContentService, ContentAdapterFactory, ContentAuditGuard, DouyinAuthClient],
 })
 export class ContentModerationModule {}