refactor: 区分导航栏中的系统设置菜单

- 将 SystemSettingResource 导航标签改为'配置项管理'
- 将 ManageSystemSettings 导航标签改为'系统配置'
- 明确区分配置项管理和系统配置功能

app/Filament/Pages/ManageSystemSettings.php

@@ -14,9 +14,9 @@ class ManageSystemSettings extends Page
 
     protected static string $view = 'filament.pages.manage-system-settings';
 
-    protected static ?string $navigationLabel = '系统设置';
+    protected static ?string $navigationLabel = '系统配置';
 
-    protected static ?string $title = '系统设置';
+    protected static ?string $title = '系统配置';
 
     protected static ?int $navigationSort = 1;