refactor(mikrotikBackupRoutes, mikrotikBackupScheduler, mikrotikApplyService): replace direct export command with file-based export method for improved reliability and error handling

backend/routes/mikrotikBackupRoutes.js

@@ -15,7 +15,7 @@ const crypto = require('crypto');
 const { sendError, sendOk } = require('../middleware/errorHandler');
 const { writeS3TextObject, readS3TextObject, listS3Objects } = require('../services/s3Service');
 const { readServersFromS3 } = require('./serversRoutes');
-const { createRosClient } = require('../services/mikrotikApplyService');
+const { createRosClient, fetchExportViaFile } = require('../services/mikrotikApplyService');
 const { decrypt } = require('../utils/encryption');
 
 const BACKUP_PREFIX = 'backups/mikrotik';
@@ -261,29 +261,8 @@ async function runBackupNow(req, res) {
       throw e;
     }
 
-    // /rest/execute с командой "/export compact terse", как в планировщике
-    const resp = await client.command('execute', { script: '/export compact terse' });
-    const data = resp && resp.data;
-    let config = '';
-    if (typeof data === 'string') config = data;
-    else if (Array.isArray(data)) {
-      config = data
-        .map((line) => {
-          if (typeof line === 'string') return line;
-          if (line && typeof line === 'object') {
-            if (line.rsc) return String(line.rsc);
-            if (line.config) return String(line.config);
-            return JSON.stringify(line);
-          }
-          return String(line ?? '');
-        })
-        .join('\n');
-    } else if (data && typeof data === 'object') {
-      config = JSON.stringify(data, null, 2);
-    } else {
-      config = String(data || '');
-    }
-
+    // API не возвращает текст /export напрямую — экспортируем в файл, читаем, удаляем
+    const config = await fetchExportViaFile(client);
     if (!config || !config.trim()) {
       return sendError(res, 502, 'Empty export result from MikroTik', 'E_EMPTY_EXPORT');
     }