fix: select force utf-8 in japanese enviroment (#242)

Author: gpsnmeajp

api/config.py

@@ -102,7 +102,7 @@ def load_json_config(filename):
             logger.warning(f"Configuration file {config_path} does not exist")
             return {}
 
-        with open(config_path, 'r') as f:
+        with open(config_path, 'r', encoding='utf-8') as f:
             config = json.load(f)
             config = replace_env_placeholders(config)
             return config