refactor: 配置项值字数限制修改

app/admin/controller/v1/SiteConfig.php

@@ -152,12 +152,12 @@ class SiteConfig
 
         $validate = validate([
                 'id'    => 'require|integer',
-                'value' => 'max:255'
+                'value' => 'max:512'
             ])
             ->message([
                 'id.require'    => '配置项ID不能为空',
                 'id.integer'    => '配置项ID必须是整数',
-                'value.max'     => '配置值不能超过255个字符'
+                'value.max'     => '配置值不能超过512个字符'
             ]);
         foreach ($put as $val) {
             if (!$validate->check($val)) {