refactor: 更新服务模块

- 更新ASR服务配置
- 更新服务模块导出

api/services/__init__.py

@@ -3,9 +3,11 @@
 """
 from .asr_service import asr_service
 from .tts_service import tts_service
+from .llm_service import llm_service
 
 __all__ = [
     "asr_service",
     "tts_service",
+    "llm_service",
 ]
 

api/services/asr_service.py

@@ -1,9 +1,9 @@
 """
 ASR 服务：语音转文字
 """
-import os
 import base64
-from typing import Optional, Any, Coroutine
+import os
+
 from openai import OpenAI