Refactor `audio_generator/manager.py`: streamline imports, remove redundant modules in `register_all_tts`, and adjust dynamic import spec for improved maintainability.

src/VoiceDialogue/services/audio/audio_generator/manager.py

@@ -1,10 +1,13 @@
-import logging
+import importlib.util
 import inspect
-from dataclasses import dataclass
+import logging
 import re
-from typing import Dict, Type, Optional
+from dataclasses import dataclass
+from pathlib import Path
+from typing import Dict, Type
+
+from .models.base import BaseTTSConfig
 from .runtime.interface import TTSInterface
-from .models.base import BaseTTSConfig, TTSConfigType
 
 
 @dataclass
@@ -140,10 +143,7 @@ tts_manager = TTSManager()
 
 def register_all_tts():
     """自动发现并注册runtime目录中的所有TTS实现"""
-    import os
-    import importlib
-    from pathlib import Path
-    
+
     # 获取runtime目录路径
     runtime_dir = Path(__file__).parent / "runtime"
     
@@ -155,7 +155,7 @@ def register_all_tts():
         module_name = py_file.stem
         try:
             spec = importlib.util.spec_from_file_location(
-                f"runtime.{module_name}", 
+                f".runtime.{module_name}",
                 py_file
             )
             module = importlib.util.module_from_spec(spec)