feat: Enhance server security and performance by adding helmet for security headers, implementing rate limiting, and centralizing error handling; update frontend API calls to use a dedicated api module for consistency

frontend/src/Dashboard.jsx

@@ -1,6 +1,6 @@
 import { useState, useEffect } from 'react';
 import { Link } from 'react-router-dom';
-import axios from 'axios';
+import api from './lib/api.js';
 import {
   IconWorld,
   IconNetwork,
@@ -80,12 +80,12 @@ function Dashboard() {
       try {
         // Загружаем данные с обработкой ошибок для каждого endpoint
         const results = await Promise.allSettled([
-          axios.get('/api/domains-new', { params: { countOnly: true } }),
-          axios.get('/api/ip-ranges', { params: { countOnly: true } }),
-          axios.get('/api/asns', { params: { countOnly: true } }),
-          axios.get('/api/servers'),
-          axios.get('/api/servers/availability', { params: { ttlSeconds: 60 } }),
-          axios.get('/api/s3/last-modified')
+          api.get('/domains-new', { params: { countOnly: true } }),
+          api.get('/ip-ranges', { params: { countOnly: true } }),
+          api.get('/asns', { params: { countOnly: true } }),
+          api.get('/servers'),
+          api.get('/servers/availability', { params: { ttlSeconds: 60 } }),
+          api.get('/s3/last-modified')
         ]);
 
         // Обрабатываем результаты