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/Faq.js

@@ -0,0 +1,30 @@
+// بلوک سوالات متداول — همان منبع دادهٔ FAQPage schema، تا متن دیده‌شده و schema واگرا نشوند.
+// استایل با کارت‌های موجود سایت هم‌خانواده است (bg سفید، rounded-lg، border روشن).
+function Faq({ items = [] }) {
+  if (!items.length) return null;
+
+  return (
+    <section className="mt-[48px]">
+      <h2 className="text-[#3B3B3B] text-[16px] sm:text-[19px] md:text-[22px] lg:text-[24px] font-bold mb-[24px]">
+        سوالات متداول
+      </h2>
+      <div className="flex flex-col gap-[16px]">
+        {items.map((item) => (
+          <details
+            key={item.question}
+            className="p-4 rounded-lg bg-[#FFF] border border-[#EFEFEF]"
+          >
+            <summary className="text-[#3B3B3B] text-[16px] font-bold cursor-pointer">
+              {item.question}
+            </summary>
+            <p className="text-[#525252] text-[14px] md:text-[16px] font-normal mt-[12px] leading-8">
+              {item.answer}
+            </p>
+          </details>
+        ))}
+      </div>
+    </section>
+  );
+}
+
+export default Faq;