Refactor `SessionIdManager` module: rename `session_id_manager.py` to `session_manager.py` and update imports accordingly.

src/VoiceDialogue/core/constants.py

@@ -3,7 +3,7 @@ import threading
 from collections import OrderedDict
 
 from utils.cache import LRUCacheDict
-from .session_id_manager import SessionIdManager
+from .session_manager import SessionIdManager
 from .state_manager import VoiceStateManager
 
 # ======================= 音频配置常量 =======================