fix: remove unnecessary mixin config

Author: nelvko

resources/mixin.yaml

@@ -10,7 +10,7 @@ external-ui-url: https://github.com/Zephyruso/zashboard/releases/latest/download
 secret:
 
 allow-lan: false # 若开启务必设置用户验证以防暴露公网后被滥用
-authentication:
+# authentication:
   # - "username:password" # 用户验证（clashon 会自动填充）
 
 # prefix：前置插入