fix: 优化边缘端稳定性和日志管理

1. database.py: 优化数据库连接和错误处理
2. postprocessor.py: 改进后处理逻辑
3. result_reporter.py: 完善告警上报字段
4. video_stream.py: 增强视频流稳定性
5. main.py: 优化启动流程和异常处理
6. logger.py: 改进日志格式和轮转配置

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

utils/logger.py

@@ -87,29 +87,34 @@ class StructuredLogger:
     def _init_logger(self):
         """初始化日志配置"""
         settings = get_settings()
-        
+
         self._log_level = getattr(logging, settings.log_level.upper(), logging.INFO)
         self._log_dir = settings.log_dir
         self._max_size = settings.log_file_max_size
         self._backup_count = settings.log_file_backup_count
-        
+
         os.makedirs(self._log_dir, exist_ok=True)
-        
-        self._logger = logging.getLogger(self.name)
-        self._logger.setLevel(self._log_level)
-        
-        self._logger.handlers.clear()
-        
+
         formatter = logging.Formatter(
             fmt='%(asctime)s | %(levelname)-8s | %(name)s | %(message)s',
             datefmt='%Y-%m-%d %H:%M:%S'
         )
-        
-        console_handler = logging.StreamHandler(sys.stdout)
-        console_handler.setLevel(self._log_level)
-        console_handler.setFormatter(formatter)
-        self._logger.addHandler(console_handler)
-        
+
+        # 配置 root logger，使所有模块的 logging.getLogger(name) 都能输出
+        root_logger = logging.getLogger()
+        root_logger.setLevel(self._log_level)
+        if not root_logger.handlers:
+            console_handler = logging.StreamHandler(sys.stdout)
+            console_handler.setLevel(self._log_level)
+            console_handler.setFormatter(formatter)
+            root_logger.addHandler(console_handler)
+
+        # 配置命名 logger（主模块专用，写入独立日志文件）
+        self._logger = logging.getLogger(self.name)
+        self._logger.setLevel(self._log_level)
+        self._logger.handlers.clear()
+        self._logger.propagate = True  # 通过 root logger 输出到控制台
+
         self._add_file_handler(formatter)
     
     def _add_file_handler(self, formatter: logging.Formatter):