feat(im): 新增importAccountsWithNames方法，addGroupMember时批量导入账号名称

- 新增 importAccountsWithNames 方法，使用腾讯IM新版 AccountList 格式导入账号及昵称
- addGroupMember 改为调用新方法，一次批量导入账号+名称
- multiAccountImport 旧方法保持不变，不影响其他调用方
- AddGroupMemberDTO.memberName 移除@JsonIgnore，确保Feign跨服务传输

Co-Authored-By: Claude <noreply@anthropic.com>

health-im/health-im-biz/src/main/java/com/renkang/im/util/TencentCloudImUtil.java

@@ -164,6 +164,22 @@ public class TencentCloudImUtil {
         return result;
     }
 
+    /**
+     * 导入多个账号（带昵称）
+     *
+     * @param accounts 账号信息列表，每个元素包含 UserID 和可选的 Nick
+     */
+    public String importAccountsWithNames(List<JSONObject> accounts) {
+        Integer random = RandomUtils.nextInt(0, 999999999);
+        String httpsUrl = getHttpsUrl(TencentCloudImApiConstant.AccountManage.MULTI_ACCOUNT_IMPORT, random);
+        JSONObject jsonObject = new JSONObject();
+        jsonObject.put("AccountList", accounts);
+        log.info("腾讯云im导入多个账号，请求参数：{}", jsonObject);
+        String result = HttpUtil.doPost(httpsUrl, jsonObject);
+        log.info("腾讯云im导入多个账户，返回结果：{}", result);
+        return result;
+    }
+
     /**
      * 删除账号
      *
@@ -526,22 +542,18 @@ public class TencentCloudImUtil {
      */
     public AddGroupMemberVO addGroupMember(AddGroupMemberDTO dto) {
         try {
-            // 先导入账号，确保成员在IM系统中已注册
+            // 先导入账号及其名称，确保成员在IM系统中已注册
             if (dto.getMemberList() != null && !dto.getMemberList().isEmpty()) {
-                List<String> memberAccounts = dto.getMemberList().stream()
-                        .map(AddGroupMemberDTO.MemberListDTO::getMemberAccount)
-                        .collect(Collectors.toList());
-                multiAccountImport(memberAccounts);
-                // 导入成员名称（失败不影响主流程）
-                for (AddGroupMemberDTO.MemberListDTO member : dto.getMemberList()) {
+                // 构建腾讯IM新版 AccountList 格式（含昵称）
+                List<JSONObject> accountList = dto.getMemberList().stream().map(member -> {
+                    JSONObject account = new JSONObject();
+                    account.put("UserID", member.getMemberAccount());
                     if (StringUtils.isNotEmpty(member.getMemberName())) {
-                        try {
-                            accountImport(member.getMemberAccount(), member.getMemberName(), null);
-                        } catch (Exception e) {
-                            log.warn("导入群成员名称失败, account={}, name={}", member.getMemberAccount(), member.getMemberName(), e);
-                        }
+                        account.put("Nick", member.getMemberName());
                     }
-                }
+                    return account;
+                }).collect(Collectors.toList());
+                importAccountsWithNames(accountList);
             }
 
             Integer random = RandomUtils.nextInt(0, 999999999);