refactor(database): 重构数据库存储实现，使用SQLAlchemy ORM替代原始SQL操作

- 删除旧的async_db.py和async_sqlite_db.py实现
- 新增SQLAlchemy ORM模型和数据库会话管理
- 统一各平台存储实现到_store_impl.py文件
- 添加数据库初始化功能支持
- 更新.gitignore和pyproject.toml依赖配置
- 优化文件存储路径和命名规范

database/db_session.py

@@ -0,0 +1,51 @@
+from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession
+from sqlalchemy.orm import sessionmaker
+from contextlib import asynccontextmanager
+from .models import Base
+from config import SAVE_DATA_OPTION
+from config.db_config import mysql_db_config, sqlite_db_config
+
+# Keep a cache of engines
+_engines = {}
+
+def get_async_engine(db_type: str = None):
+    if db_type is None:
+        db_type = SAVE_DATA_OPTION
+
+    if db_type in _engines:
+        return _engines[db_type]
+
+    if db_type in ["json", "csv"]:
+        return None
+
+    if db_type == "sqlite":
+        db_url = f"sqlite+aiosqlite:///{sqlite_db_config['db_path']}"
+    elif db_type == "mysql" or db_type == "db":
+        db_url = f"mysql+asyncmy://{mysql_db_config['user']}:{mysql_db_config['password']}@{mysql_db_config['host']}:{mysql_db_config['port']}/{mysql_db_config['db_name']}"
+    else:
+        raise ValueError(f"Unsupported database type: {db_type}")
+
+    engine = create_async_engine(db_url, echo=False)
+    _engines[db_type] = engine
+    return engine
+
+
+async def create_tables(db_type: str = None):
+    engine = get_async_engine(db_type)
+    async with engine.begin() as conn:
+        await conn.run_sync(Base.metadata.create_all)
+
+
+@asynccontextmanager
+async def get_session() -> AsyncSession:
+    engine = get_async_engine(SAVE_DATA_OPTION)
+    AsyncSessionFactory = sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)
+    session = AsyncSessionFactory()
+    try:
+        yield session
+        await session.commit()
+    except Exception as e:
+        await session.rollback()
+        raise e
+    finally:
+        await session.close()