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/list/index.js

@@ -7,7 +7,7 @@ function List({ specialties = [], cityName, stateName }) {
       <div className="flex items-center justify-center gap-[12px] pt-[24px] mb-[40px]">
         <MenuS />
         <h1 className="text-[#3B3B3B] text-[16px] sm:text-[19px] md:text-[22px] lg:text-[24px] font-bold">
-          لیست تخصص ها
+          لیست تخصص‌های پزشکی در {cityName || "ایران"}
         </h1>
       </div>
       {specialties.length === 0 ? (