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/doctors/page.js

@@ -4,7 +4,20 @@ import { buildDoctorParams } from "@/helper";
 import { getStateInfo } from "@/lib/getStateInfo";
 import { fetchReq } from "@/lib/req";
 
-export async function generateMetadata() {
+
+const FILTER_KEYS = ["specialty", "state", "city", "gender", "degree", "active", "sort", "name"];
+
+// جستجوی داخلی و ترکیب چند فیلتر نباید ایندکس شوند — crawl budget و duplicate
+function listingRobots(params) {
+    const activeFilters = FILTER_KEYS.filter((key) => params?.[key]);
+    if (params?.name || activeFilters.length >= 2) {
+        return { robots: { index: false, follow: true } };
+    }
+    return {};
+}
+
+export async function generateMetadata({ searchParams }) {
+  const awaitedParams = await searchParams;
   const { matchedCity, matchedState } = await getStateInfo();
   const siteName = matchedCity?.site_name || "نوبت 724";
   const cityName = matchedCity?.name || matchedState?.name || "";
@@ -14,10 +27,11 @@ export async function generateMetadata() {
   const description = cityName
     ? `لیست پزشکان متخصص در ${cityName}. جستجو بر اساس تخصص و منطقه. رزرو آنلاین نوبت پزشکی در ${cityName}.`
     : `جستجوی پزشکان متخصص در سراسر کشور. رزرو آنلاین نوبت پزشکی سریع و آسان با نوبت 724.`;
-  const image = "https://www.nobat724.com/assets/images/logo.png";
+  const image = "https://nobat724.com/assets/images/logo.png";
   return {
     title,
     description,
+    ...listingRobots(awaitedParams),
     openGraph: { title, description, images: [image] },
     twitter: { card: "summary_large_image", title, description, images: [image] },
   };