refactor(app): 优化枚举值验证和用户搜索逻辑

- 在 EnumUtil 中增加对枚举字段值的空值检查，避免不必要的验证
- 在 ZeroUserRepository 中将 not null 检查改为 empty 检查，提高搜索准确性

app/common/repositories/user/ZeroUserRepository.php

@@ -93,17 +93,17 @@ class ZeroUserRepository extends BaseRepository
         $where = [];
         
         // 状态条件 - 精确搜索
-        if (!is_null($param->status)) {
+        if (!empty($param->status)) {
             $where[] = ['status', '=', $param->status];
         }
         
         // 团队昵称条件 - 模糊搜索
-        if (!is_null($param->teamName)) {
+        if (!empty($param->teamName)) {
             $where[] = ['team_name', 'like', '%' . $param->teamName . '%'];
         }
         
         // 团队长uid条件 - 精确搜索
-        if (!is_null($param->account)) {
+        if (!empty($param->account)) {
             $userDao = new UserDao();
             $userWhere[] = ['account','like','%' . $param->account . '%'];
             $userData = $userDao->getWhere($userWhere,'uid');

app/utils/EnumUtil.php

@@ -31,8 +31,10 @@ class EnumUtil
                 }
 
                 $fieldName = self::constToFieldName($constName);
-
                 if (array_key_exists($fieldName, $requestData)) {
+                    if (empty($requestData[$fieldName])) {
+                        continue;
+                    }
                     $result = self::validateEnumValue($requestData[$fieldName], $enumValues, $constName);
                     if (!$result['valid']) {
                         $errors[] = $result['error'];