Add dedicated local admin domain routing

app/_admin/page.tsx

@@ -20,6 +20,7 @@ import {
   resetAdminFailedAttempts,
   setAdminSessionCookie,
 } from "@/lib/admin-auth";
+import { getAdminAppPath } from "@/lib/admin-routing";
 import { getMaintenanceMode } from "@/lib/app-config";
 import { getAdminMediaAssets } from "@/lib/media";
 import { getAdminPortfolioCategories, getAdminPortfolioProjects } from "@/lib/portfolio";
@@ -76,28 +77,28 @@ export default async function AdminPage({ searchParams }: AdminPageProps) {
     const currentLockState = await getAdminLockState();
 
     if (currentLockState.locked) {
-      redirect("/?error=locked");
+      redirect(`${getAdminAppPath("/")}?error=locked`);
     }
 
     if (!isAdminAuthConfigured() || !isPasswordValid(password)) {
       const failState = await registerFailedAdminAttempt();
       if (failState.locked) {
-        redirect("/?error=locked");
+        redirect(`${getAdminAppPath("/")}?error=locked`);
       }
 
-      redirect("/?error=invalid");
+      redirect(`${getAdminAppPath("/")}?error=invalid`);
     }
 
     await resetAdminFailedAttempts();
     await setAdminSessionCookie();
-    redirect("/");
+    redirect(getAdminAppPath("/"));
   }
 
   async function logoutAction() {
     "use server";
 
     await clearAdminSessionCookie();
-    redirect("/");
+    redirect(getAdminAppPath("/"));
   }
 
   if (!authenticated) {