添加获取TTS模型参考音频的API路由，支持通过模型ID获取音频文件。

src/voice_dialogue/api/routes/tts_routes.py

@@ -1,6 +1,7 @@
 from typing import Optional
 
 from fastapi import APIRouter, HTTPException, BackgroundTasks, Request
+from fastapi.responses import FileResponse
 
 from voice_dialogue.services.audio.generators import tts_config_registry
 from voice_dialogue.utils.logger import logger
@@ -397,3 +398,41 @@ def _find_config_by_id(model_id: str) -> Optional:
         if config_id == model_id:
             return config
     return None
+
+
+@router.get("/models/{model_id}/reference-audio", summary="获取TTS模型参考音频")
+async def get_tts_model_reference_audio(model_id: str):
+    """
+    通过模型ID获取TTS模型的参考音频文件
+    """
+    try:
+        # 通过ID找到对应的配置
+        config = _find_config_by_id(model_id)
+        if not config:
+            raise HTTPException(status_code=404, detail="模型ID不存在")
+
+        # 检查模型是否已经下载
+        if not config.is_model_complete():
+            raise HTTPException(status_code=400, detail="模型尚未下载，无法获取参考音频")
+
+        # 获取参考音频文件路径
+        reference_audio_path = ''
+        if hasattr(config, "reference_audio_path"):
+            reference_audio_path = config.reference_audio_path
+
+        # 检查文件是否存在
+        if reference_audio_path and not reference_audio_path.exists():
+            raise HTTPException(status_code=404, detail="参考音频文件不存在")
+
+        # 返回音频文件
+        return FileResponse(
+            path=str(reference_audio_path),
+            media_type="audio/wav",
+            filename=f"{config.character_name}_reference.wav"
+        )
+
+    except HTTPException:
+        raise
+    except Exception as e:
+        logger.error(f"获取TTS模型参考音频失败: {e}", exc_info=True)
+        raise HTTPException(status_code=500, detail=f"获取参考音频失败: {str(e)}")