fix: respect user-specified log level in set_logger

Previously, the set_logger function would always set the log level to DEBUG, overriding any user-specified log level.

lightrag/lightrag.py

@@ -263,9 +263,8 @@ class LightRAG:
     _storages_status: StoragesStatus = field(default=StoragesStatus.NOT_CREATED)
 
     def __post_init__(self):
-        logger.setLevel(self.log_level)
         os.makedirs(os.path.dirname(self.log_file_path), exist_ok=True)
-        set_logger(self.log_file_path)
+        set_logger(self.log_file_path, self.log_level)
         logger.info(f"Logger initialized for working directory: {self.working_dir}")
 
         if not os.path.exists(self.working_dir):