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/schedule/llm_generator.py

@@ -9,7 +9,7 @@ from json_repair import repair_json
 from lunar_python import Lunar
 
 from src.chat.utils.prompt import global_prompt_manager
-from src.common.database.sqlalchemy_models import MonthlyPlan
+from src.common.database.core.models import MonthlyPlan
 from src.common.logger import get_logger
 from src.config.config import global_config, model_config
 from src.llm_models.utils_model import LLMRequest

src/schedule/schedule_manager.py

@@ -5,7 +5,7 @@ from typing import Any
 import orjson
 from sqlalchemy import select
 
-from src.common.database.sqlalchemy_models import MonthlyPlan, Schedule, get_db_session
+from src.common.database.core.models import MonthlyPlan, Schedule, get_db_session
 from src.common.logger import get_logger
 from src.config.config import global_config
 from src.manager.async_task_manager import AsyncTask, async_task_manager