fix: 修复DouyinAuthClient方法签名和添加详细调试信息

- 将getAccessToken方法改为async异步方法
- 在构造函数中添加配置和Client创建的调试信息
- 在getAccessToken方法中添加完整的调用流程调试
- 添加try-catch错误处理和详细的错误日志
- 隐藏敏感的clientSecret信息在日志中

src/content-moderation/adapters/DouYinClient.ts

@@ -18,13 +18,29 @@ body:
 export class DouyinAuthClient {
     private readonly client: Client;
     constructor(private config: ConfigService) {
+        console.log('DouyinAuthClient constructor - creating client with:', {
+            clientKey: this.config.get('BYTEDANCE_APP_ID') || '',
+            clientSecret: this.config.get('BYTEDANCE_APP_SECRET') ? '***' : 'empty'
+        });
         this.client = new Client({
             clientKey: this.config.get('BYTEDANCE_APP_ID') || '',
             clientSecret: this.config.get('BYTEDANCE_APP_SECRET') || '',
-        })
+        });
+        console.log('DouyinAuthClient constructor - client created:', !!this.client);
+        console.log('DouyinAuthClient constructor - client.getAccessToken type:', typeof this.client.getAccessToken);
     }
 
-    getAccessToken() {
-        return this.client.getAccessToken()
+    async getAccessToken() {
+        console.log('DouyinAuthClient.getAccessToken called');
+        console.log('client:', !!this.client);
+        console.log('client.getAccessToken type:', typeof this.client.getAccessToken);
+        try {
+            const result = await this.client.getAccessToken();
+            console.log('getAccessToken result:', result);
+            return result;
+        } catch (error) {
+            console.error('getAccessToken error:', error);
+            throw error;
+        }
     }
 }