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/blogs/page.js

@@ -7,10 +7,12 @@ export async function generateMetadata() {
   const siteName = matchedCity?.site_name || "نوبت 724";
   const title = `مقالات و اخبار پزشکی | ${siteName}`;
   const description = `جدیدترین مقالات، اخبار و راهنماهای پزشکی. اطلاعات تخصصی در حوزه سلامت و پزشکی از متخصصان ${siteName}.`;
-  const image = "https://www.nobat724.com/assets/images/logo.png";
+  const image = "https://nobat724.com/assets/images/logo.png";
   return {
     title,
     description,
+    // مقالات روی همه‌ی دامنه‌ها یکسان‌اند — تجمیع روی دامنه‌ی اصلی
+    alternates: { canonical: "https://nobat724.com/blogs" },
     openGraph: { title, description, images: [image] },
     twitter: { card: "summary_large_image", title, description, images: [image] },
   };