fix(lint): 修复 CI 中的 ineffassign 和 unused 代码告警，修正 group 排序集成测试兼容性

backend/internal/service/setting_service.go

@@ -1109,14 +1109,6 @@ func normalizeTablePreferences(defaultPageSize int, options []int) (int, []int)
 	return defaultPageSize, normalizedOptions
 }
 
-func containsInt(values []int, target int) bool {
-	for _, value := range values {
-		if value == target {
-			return true
-		}
-	}
-	return false
-}
 
 // getStringOrDefault 获取字符串值或默认值
 func (s *SettingService) getStringOrDefault(settings map[string]string, key, defaultValue string) string {