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/clinic/components/about/ContentDetail.js

@@ -1,11 +1,12 @@
 import TextLoading from "@/app/component/loading/Text";
 import React from "react";
 
-function ContentDetail({ head, children }) {
+// عنوان بخش‌ها h2 است؛ فقط نام خود کلینیک h1 می‌گیرد (as="h1"). کلاس‌ها یکسان — بدون تغییر بصری.
+function ContentDetail({ head, children, as: Heading = "h2" }) {
   return (
     <div className="my-[24px]">
       <TextLoading width={200} height={20}>
-        <h1 className="text-[#3B3B3B] text-[20px] font-bold">{head}</h1>
+        <Heading className="text-[#3B3B3B] text-[20px] font-bold">{head}</Heading>
       </TextLoading>
       <div className="mt-[16px]">{children}</div>
     </div>

components/clinic/components/about/index.js

@@ -9,7 +9,7 @@ function About({ data }) {
   return (
     <div className="opacity-page transition-all duration-500">
       <Images data={data} />
-      <ContentDetail head={data.title}>
+      <ContentDetail head={data.title} as="h1">
         <TextDetail data={data} />
       </ContentDetail>
       <ContentDetail head="بیمه های طرف قرارداد">