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`.

lib/getStateInfo.js

@@ -3,14 +3,46 @@ import { headers } from "next/headers";
 // Data
 import citiesData from "@/data/city.json";
 import statesData from "@/data/state.json";
+import { fetchReq } from "@/lib/req";
 
 import { ROOT_CITY_ID, isRootCity } from "@/lib/rootCity";
 export { ROOT_CITY_ID, isRootCity };
 
+const API_URL = process.env.NEXT_PUBLIC_API_URL;
+
+// دامنه‌های خارج از city.json (دامنه اختصاصی نمایندگان سراسری) از backend پرسیده می‌شوند
+// (GET /api/v1/site-context). cache ماژول‌سطح تا هر render یک درخواست نزند؛
+// خطای شبکه هرگز صفحه را نمی‌شکند (null = مثل دامنه ناشناخته).
+const SITE_CONTEXT_TTL_MS = 5 * 60 * 1000;
+const siteContextCache = new Map();
+
+async function fetchSiteContext(host) {
+  if (!host || host === "localhost" || host === "127.0.0.1" || !API_URL) return null;
+
+  const cached = siteContextCache.get(host);
+  if (cached && cached.expires > Date.now()) return cached.value;
+
+  let value = null;
+  try {
+    const json = await fetchReq(
+      `${API_URL}/api/v1/site-context?domain=${encodeURIComponent(host)}`
+    );
+    if (json?.data?.type === "representation") {
+      value = json.data.representation; // { uuid, full_name, is_global }
+    }
+  } catch {
+    value = null;
+  }
+
+  siteContextCache.set(host, { value, expires: Date.now() + SITE_CONTEXT_TTL_MS });
+  return value;
+}
+
 export async function getStateInfo() {
   const headersList = await headers();
 
-  const host = headersList.get("host") || "";
+  const rawHost = headersList.get("host") || "";
+  const host = rawHost.split(":")[0];
   const subdomain = host.split(".")[0];
 
   // Match city by domain (supports both full domain and subdomain)
@@ -23,5 +55,14 @@ export async function getStateInfo() {
     matchedCity &&
     statesData.find((state) => state.id === matchedCity.province_id);
 
-  return { matchedCity, matchedState, isRoot: isRootCity(matchedCity) };
+  // فقط وقتی هیچ شهری match نشد سراغ backend می‌رویم — رفتار دامنه‌های شهری دست‌نخورده می‌ماند.
+  const repContext = matchedCity ? null : await fetchSiteContext(host);
+
+  return {
+    matchedCity,
+    matchedState,
+    isRoot: isRootCity(matchedCity),
+    repContext,
+    host,
+  };
 }