Clean up TTS module dependencies

- Remove references to deleted tts_config.py
- Simplify tts_routes.py to directly return TTSGeminiChatService
- Update __init__.py imports
- Prepare for multi-speaker TTS testing

app/service/tts/multi_speaker/__init__.py

@@ -4,17 +4,14 @@ Multi-speaker TTS functionality for conversation scenarios
 """
 
 from .tts_chat_service import TTSGeminiChatService
-from .tts_config import TTSConfig, create_chat_service
 from .tts_models import TTSGenerationConfig, MultiSpeakerVoiceConfig, SpeechConfig, TTSRequest
 from .tts_response_handler import TTSResponseHandler
 from .tts_routes import get_tts_chat_service
 
 __all__ = [
     "TTSGeminiChatService",
-    "TTSConfig", 
-    "create_chat_service",
     "TTSGenerationConfig",
-    "MultiSpeakerVoiceConfig", 
+    "MultiSpeakerVoiceConfig",
     "SpeechConfig",
     "TTSRequest",
     "TTSResponseHandler",

app/service/tts/multi_speaker/tts_routes.py

@@ -1,17 +1,13 @@
 """
 TTS路由扩展
-可选的路由覆盖，用于启用TTS功能
-使用时可以替换原始路由的依赖注入
+提供多人TTS增强服务
 """
 
 from fastapi import Depends
-from typing import Union
 
 from app.config.config import settings
 from app.service.key.key_manager import KeyManager, get_key_manager_instance
-from app.service.chat.gemini_chat_service import GeminiChatService
 from app.service.tts.multi_speaker.tts_chat_service import TTSGeminiChatService
-from app.service.tts.multi_speaker.tts_config import TTSConfig
 
 
 async def get_key_manager():
@@ -19,23 +15,10 @@ async def get_key_manager():
     return get_key_manager_instance()
 
 
-async def get_tts_chat_service(key_manager: KeyManager = Depends(get_key_manager)) -> Union[GeminiChatService, TTSGeminiChatService]:
+async def get_tts_chat_service(key_manager: KeyManager = Depends(get_key_manager)) -> TTSGeminiChatService:
     """
-    获取聊天服务实例（支持TTS）
-    根据配置返回原始服务或TTS增强服务
+    获取多人TTS增强聊天服务实例
     """
-    return TTSConfig.get_chat_service(settings.BASE_URL, key_manager)
+    return TTSGeminiChatService(settings.BASE_URL, key_manager)
 
 
-# 使用说明：
-# 要启用TTS功能，需要：
-# 1. 设置环境变量 ENABLE_TTS=true
-# 2. 在路由中使用 get_tts_chat_service 替换 get_chat_service
-# 
-# 例如在 gemini_routes.py 中：
-# from app.service.tts.multi_speaker.tts_routes import get_tts_chat_service
-# 
-# async def generate_content(
-#     chat_service = Depends(get_tts_chat_service)  # 替换原来的依赖
-# ):
-#     ...