Add dedicated local admin domain routing

app/_admin/marquee/actions.ts

@@ -4,7 +4,7 @@ import { revalidatePath } from "next/cache";
 import { redirect } from "next/navigation";
 import { isRedirectError } from "next/dist/client/components/redirect-error";
 
-import { toInternalAdminPath } from "@/lib/admin-routing";
+import { getAdminAppPath, toInternalAdminPath } from "@/lib/admin-routing";
 import { clearAdminSessionCookie, isAdminAuthenticated } from "@/lib/admin-auth";
 import { updateMarqueeSettings } from "@/lib/app-config";
 import { routing } from "@/i18n/routing";
@@ -13,7 +13,7 @@ import { getLocalizedPath } from "@/lib/locale";
 async function ensureAdmin() {
   if (!(await isAdminAuthenticated())) {
     await clearAdminSessionCookie();
-    redirect("/");
+    redirect(getAdminAppPath("/"));
   }
 }
 
@@ -72,13 +72,13 @@ export async function saveMarqueeSettingsAction(formData: FormData) {
     await updateMarqueeSettings(settings);
     await revalidateMarqueePages();
 
-    redirect(withMessage("/marquee", "success", "Marquee gespeichert."));
+    redirect(withMessage(getAdminAppPath("/marquee"), "success", "Marquee gespeichert."));
   } catch (error) {
     if (isRedirectError(error)) {
       throw error;
     }
 
     const message = error instanceof Error ? error.message : "Marquee konnte nicht gespeichert werden.";
-    redirect(withMessage("/marquee", "error", message));
+    redirect(withMessage(getAdminAppPath("/marquee"), "error", message));
   }
 }