feat: add canonical URL handling and entity quality checks

- Implemented canonical URL strategies for city-specific domains and entities.
- Added helper functions for domain and city resolution.
- Created tests for canonical URL generation and domain resolution.
- Introduced entity quality checks for doctors and clinics to ensure meaningful content.
- Developed unique introductory texts for listing pages to avoid duplicate content.
- Established robots.txt policies for listing pages to manage indexing based on user filters.
- Enhanced specialty content with dynamic introductions and FAQs to improve SEO.

components/specialties/detail/index.js

@@ -0,0 +1,36 @@
+import Pageguide from "@/app/component/Pageguide";
+import DoctorGrid from "./DoctorGrid";
+import Faq from "./Faq";
+
+// چیدمان عمداً هم‌خانوادهٔ /doctors است: همان padding-responsive، همان فاصلهٔ بالای صفحه،
+// همان تایپوگرافی عنوان و همان گرید کارت پزشک — کاربر نباید حس کند وارد بخش دیگری شده.
+function SpecialtyDetailPage({ specialtyName, cityName, doctors, intro, faq, origin }) {
+  return (
+    <div className="pt-[95px] sm:pt-[120px] padding-responsive">
+      <Pageguide
+        origin={origin}
+        list={[
+          { name: "خانه", href: "/" },
+          { name: "تخصص‌ها", href: "/specialties" },
+          { name: specialtyName },
+        ]}
+      />
+
+      <h1 className="text-[#3B3B3B] text-[16px] sm:text-[19px] md:text-[22px] lg:text-[24px] text-center font-bold mt-[24px]">
+        متخصص {specialtyName} در {cityName}
+      </h1>
+
+      <p className="text-[#525252] text-[14px] md:text-[16px] font-normal leading-8 mt-[16px] text-justify">
+        {intro}
+      </p>
+
+      <div className="mt-[24px] sm:mt-[37px] md:mt-[50px] lg:mt-[64px]">
+        <DoctorGrid doctors={doctors} />
+      </div>
+
+      <Faq items={faq} />
+    </div>
+  );
+}
+
+export default SpecialtyDetailPage;