feat: 重构数据库导入路径，移除旧的数据库模块并添加新的数据库实现

src/chat/focus_chat/heartflow_prompt_builder.py

@@ -7,7 +7,7 @@ from src.chat.person_info.relationship_manager import relationship_manager
 from src.chat.utils.utils import get_embedding
 import time
 from typing import Union, Optional, Dict, Any
-from src.common.database import db
+from common.database.database import db
 from src.chat.utils.utils import get_recent_group_speaker
 from src.manager.mood_manager import mood_manager
 from src.chat.memory_system.Hippocampus import HippocampusManager