refactor: 完成数据库重构 - 批量更新导入路径

- 更新35个文件的导入路径 (共65处修改)
- sqlalchemy_models  core.models (模型类)
- sqlalchemy_database_api  compatibility (兼容函数)
- database.database  core (初始化/关闭函数)
- 添加自动化导入更新工具 (scripts/update_database_imports.py)
- 所有兼容性层测试通过 (26/26)
- 数据库核心功能测试通过 (18/21)

src/common/cache_manager.py

@@ -8,8 +8,8 @@ import numpy as np
 import orjson
 
 from src.common.config_helpers import resolve_embedding_dimension
-from src.common.database.sqlalchemy_database_api import db_query, db_save
-from src.common.database.sqlalchemy_models import CacheEntries
+from src.common.database.compatibility import db_query, db_save
+from src.common.database.core.models import CacheEntries
 from src.common.logger import get_logger
 from src.common.vector_db import vector_db_service
 from src.config.config import global_config, model_config

src/common/message_repository.py

@@ -5,10 +5,10 @@ from typing import Any
 from sqlalchemy import func, not_, select
 from sqlalchemy.orm import DeclarativeBase
 
-from src.common.database.sqlalchemy_database_api import get_db_session
+from src.common.database.compatibility import get_db_session
 
 # from src.common.database.database_model import Messages
-from src.common.database.sqlalchemy_models import Messages
+from src.common.database.core.models import Messages
 from src.common.logger import get_logger
 from src.config.config import global_config