fix: 修复导入错误

- 移除不存在的 init_database 导入
- DatabaseManager  SQLiteManager

main.py

@@ -13,7 +13,6 @@ from datetime import datetime
 from typing import Dict, Any, Optional
 
 from config.settings import get_settings, Settings
-from config.database import init_database
 from core.config_sync import get_config_sync_manager, ConfigSyncManager
 from core.video_stream import MultiStreamManager, VideoFrame
 from core.preprocessor import ImagePreprocessor
@@ -63,9 +62,9 @@ class EdgeInferenceService:
     def _init_database(self):
         """初始化数据库"""
         try:
-            from config.database import DatabaseManager
-            self._db_manager = DatabaseManager()
-            if self._db_manager.is_available:
+            from config.database import SQLiteManager
+            self._db_manager = SQLiteManager()
+            if self._db_manager._conn:
                 self._logger.info("数据库初始化成功")
             else:
                 self._logger.warning("数据库不可见，服务将在无数据库模式下运行")