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.

app/specialties/page.js

@@ -10,7 +10,7 @@ export async function generateMetadata() {
     ? `تخصص‌های پزشکی در ${cityName} | ${siteName}`
     : `تخصص‌های پزشکی | ${siteName}`;
   const description = `لیست کامل تخصص‌های پزشکی${cityName ? " در " + cityName : ""}. رزرو نوبت از متخصصین مختلف به صورت آنلاین.`;
-  const image = "https://www.nobat724.com/assets/images/logo.png";
+  const image = "https://nobat724.com/assets/images/logo.png";
   return {
     title,
     description,