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/clinic/[slug]/page.js

@@ -1,8 +1,11 @@
 import { cache } from "react";
 import ClinicPage from "@/components/clinic";
 import Layout from "@/components/layout/StLayout";
+import { notFound } from "next/navigation";
 import { fetchReq } from "@/lib/req";
 import { getStateInfo } from "@/lib/getStateInfo";
+import { getRequestOrigin } from "@/lib/getCanonicalUrl";
+import { safeJsonLd } from "@/lib/sanitize";
 import { imageUrl } from "@/helper";
 
 const API_URL = process.env.NEXT_PUBLIC_API_URL;
@@ -34,7 +37,7 @@ export async function generateMetadata({ params }) {
 
     const image = clinic.images_clinic?.[0]?.url
       ? [imageUrl(clinic.images_clinic[0].url)]
-      : ["https://www.nobat724.com/assets/images/logo.png"];
+      : ["https://nobat724.com/assets/images/logo.png"];
 
     return {
       title,
@@ -72,11 +75,13 @@ function computeClinicRating(doctors) {
 
 async function Clinic({ params, searchParams }) {
   const { slug } = await params;
+  const origin = await getRequestOrigin();
   const sp = await searchParams;
   const page = Number(sp?.page) || 1;
   const limit = 50;
 
   const clinic = await getClinic(slug);
+  if (!clinic) notFound();
   const reqDoctors = await fetchReq(
     `${API_URL}/api/v1/clinic/doctor-list/${slug}?page=${page}&limit=${limit}`
   );
@@ -104,7 +109,7 @@ async function Clinic({ params, searchParams }) {
         "@context": "https://schema.org",
         "@type": "MedicalClinic",
         name: clinic.title,
-        url: `https://www.nobat724.com/clinic/${clinic.uuid}`,
+        url: `${origin}/clinic/${clinic.uuid}`,
         ...(clinic.images_clinic?.[0]?.url && {
           image: {
             "@type": "ImageObject",
@@ -150,8 +155,8 @@ async function Clinic({ params, searchParams }) {
         "@context": "https://schema.org",
         "@type": "BreadcrumbList",
         itemListElement: [
-          { "@type": "ListItem", position: 1, name: "خانه", item: "https://www.nobat724.com" },
-          { "@type": "ListItem", position: 2, name: "کلینیک‌ها", item: "https://www.nobat724.com/clinics" },
+          { "@type": "ListItem", position: 1, name: "خانه", item: origin },
+          { "@type": "ListItem", position: 2, name: "کلینیک‌ها", item: `${origin}/clinics` },
           { "@type": "ListItem", position: 3, name: clinic.title },
         ],
       }
@@ -162,13 +167,13 @@ async function Clinic({ params, searchParams }) {
       {jsonLd && (
         <script
           type="application/ld+json"
-          dangerouslySetInnerHTML={{ __html: JSON.stringify(jsonLd) }}
+          dangerouslySetInnerHTML={{ __html: safeJsonLd(jsonLd) }}
         />
       )}
       {breadcrumbJsonLd && (
         <script
           type="application/ld+json"
-          dangerouslySetInnerHTML={{ __html: JSON.stringify(breadcrumbJsonLd) }}
+          dangerouslySetInnerHTML={{ __html: safeJsonLd(breadcrumbJsonLd) }}
         />
       )}
       <Layout>