Implement multi-domain SEO improvements:

- Add metadata to login and login-verify pages to prevent indexing.
- Update robots.txt to disallow additional sensitive paths.
- Enhance sitemap generation to filter by city and include accurate last modified dates.
- Refactor canonical URL generation to support multi-domain architecture, ensuring self-canonicalization for city domains.
- Remove deprecated CanonicalHandler component and streamline canonical URL handling.
- Introduce safe JSON-LD output to prevent XSS vulnerabilities.
- Add payment layout with appropriate metadata to prevent indexing.
- Conduct a comprehensive technical SEO audit and implement necessary fixes across the application.

utils/sitemap.js

@@ -1,57 +1,5 @@
-// Utility functions for sitemap generation
-export const DOMAIN_CONFIG = {
-    MAIN_DOMAIN: 'nobat724.com',
-    MAX_SPECIALTY_COMBINATIONS: 20, // Limit specialty combinations to prevent too many URLs
-    MAIN_CITIES: ['108', '104', '111', '117', '113'], // Tehran, Isfahan, Mashhad, Shiraz, Ahvaz
-};
-
-export function isMainDomain(domain) {
-    return domain === DOMAIN_CONFIG.MAIN_DOMAIN || domain.includes('localhost') || domain.includes('127.0.0.1');
-}
-
-export function encodeUrlParam(param) {
-    return encodeURIComponent(param || '');
-}
-
-export function createSitemapUrl(baseUrl, path, params = {}) {
-    let url = `${baseUrl}${path}`;
-    const searchParams = new URLSearchParams();
-
-    Object.entries(params).forEach(([key, value]) => {
-        if (value) {
-            searchParams.append(key, value);
-        }
-    });
-
-    const queryString = searchParams.toString();
-    const fullUrl = queryString ? `${url}?${queryString}` : url;
-
-    // Escape XML entities
-    return escapeXml(fullUrl);
-}
-
-export function escapeXml(str) {
-    return str
-        .replace(/&/g, '&')
-        .replace(/</g, '&lt;')
-        .replace(/>/g, '&gt;')
-        .replace(/"/g, '&quot;')
-        .replace(/'/g, '&apos;');
-}
-
-export function createSitemapEntry(url, priority = 0.8, changeFrequency = 'weekly') {
-    return {
-        url,
-        lastModified: new Date(),
-        changeFrequency,
-        priority,
-    };
-}
-
-export function limitArray(array, limit) {
-    return limit > 0 ? array.slice(0, limit) : array;
-}
+import { buildCanonicalUrl } from '@/lib/getCanonicalUrl';
 
 export function getBaseUrl(domain) {
-    return `https://${domain}`;
-}
+    return buildCanonicalUrl(domain, '/').replace(/\/$/, '');
+}