Wire Meshkee static images, SEO, and customer account menu.

Connect homepage image slots and favicon to the API, add sitemap config and page metadata, and implement header login with profile/admin dropdown.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/app/api/auth/handoff/route.ts

@@ -0,0 +1,17 @@
+import { getBearerToken, jsonResponse, meshkeeFetch, unauthorizedResponse } from "@/lib/meshkee-server";
+
+export async function POST(request: Request) {
+  const token = getBearerToken(request);
+  if (!token) return unauthorizedResponse();
+
+  const res = await meshkeeFetch("/auth/handoff", {
+    method: "POST",
+    token,
+  });
+
+  if (!res.ok) {
+    return jsonResponse({ error: "امکان باز کردن پنل مدیریت نیست." }, res.status);
+  }
+
+  return jsonResponse(res.data);
+}