Refactor `__init__.py` in TTS runtime: streamline `__all__` handling, improve logging for import failures, and enhance maintainability of module exports.

src/VoiceDialogue/services/audio/generators/runtime/__init__.py

@@ -9,26 +9,28 @@ TTS运行时模块，包含：
 
 from .interface import TTSInterface, TTSFactory
 
+__all__ = [
+    'TTSInterface',
+    'TTSFactory',
+]
+
 # 导入所有TTS实现，确保注册装饰器被执行
 try:
     from .moyoyo import MoYoYoTTS
-    from .kokoro import KokoroTTS
 
-    __all__ = [
-        'TTSInterface',
-        'TTSFactory',
-        'MoYoYoTTS',
-        'KokoroTTS'
-    ]
+    __all__.append('MoYoYoTTS')
 except ImportError as e:
     # 如果某些TTS实现无法导入，不影响整体功能
     import logging
 
     logging.warning(f"Failed to import some TTS implementations: {e}")
-    __all__ = [
-        'TTSInterface',
-        'TTSFactory'
-    ]
 
-# 可用的TTS实现列表
-AVAILABLE_TTS_IMPLEMENTATIONS = [impl for impl in __all__ if impl.endswith('TTS')]
+try:
+    from .kokoro import KokoroTTS
+
+    __all__.append('KokoroTTS')
+except ImportError as e:
+    # 如果某些TTS实现无法导入，不影响整体功能
+    import logging
+
+    logging.warning(f"Failed to import some TTS implementations: {e}")