feat: enhance domain handling for global representatives

- Updated `getStateInfo` to fetch site context for domains not in city.json, returning `repContext` with representative details.
- Implemented caching for site context requests to optimize performance.
- Modified doctor and clinic listing pages to pass the `domain` parameter when fetching data for global representatives.
- Adjusted metadata generation in layout and pages to reflect representative branding based on `repContext`.
- Added documentation for the new functionality in `.claude/prompt/global-rep-domain-site.md`.

app/clinics/page.js

@@ -18,8 +18,8 @@ function listingRobots(params) {
 
 export async function generateMetadata({ searchParams }) {
   const awaitedParams = await searchParams;
-  const { matchedCity, matchedState } = await getStateInfo();
-  const siteName = matchedCity?.site_name || "نوبت 724";
+  const { matchedCity, matchedState, repContext } = await getStateInfo();
+  const siteName = matchedCity?.site_name || repContext?.full_name || "نوبت 724";
   const cityName = matchedCity?.name || matchedState?.name || "";
   const title = cityName
     ? `کلینیک‌های ${cityName} | جستجو و رزرو نوبت | ${siteName}`
@@ -39,7 +39,7 @@ export async function generateMetadata({ searchParams }) {
 
 export default async function Clinics({ searchParams }) {
   const awaitedSearchParams = await searchParams;
-  const { matchedCity, matchedState, isRoot } = await getStateInfo();
+  const { matchedCity, matchedState, isRoot, repContext, host } = await getStateInfo();
   const API_URL = process.env.NEXT_PUBLIC_API_URL;
   const stateParams = awaitedSearchParams.state;
   const cityParams = awaitedSearchParams.city;
@@ -59,6 +59,13 @@ export default async function Clinics({ searchParams }) {
 
     const params = buildClinicParams(newSearchParams);
 
+    // دامنه‌ی نماینده سراسری: backend فقط کلینیک‌های همان نماینده را برمی‌گرداند؛ فیلتر شهر بی‌معنی است.
+    if (repContext?.is_global) {
+      delete params.city;
+      delete params.state;
+      params.domain = host;
+    }
+
     // Req
     clinics = await fetchReq(`${API_URL}/api/v1/clinics`, {
       params,