feat(admin-auth): support username login and add dashboard logout

apps/admin/src/app/page.tsx

@@ -5,6 +5,7 @@ import Link from "next/link"
 import { redirect } from "next/navigation"
 
 import { resolveRoleFromServerContext } from "@/lib/access-server"
+import { LogoutButton } from "./logout-button"
 
 export const dynamic = "force-dynamic"
 
@@ -28,13 +29,14 @@ export default async function AdminHomePage() {
         <p className="text-sm uppercase tracking-[0.2em] text-neutral-500">Admin App</p>
         <h1 className="text-4xl font-semibold tracking-tight">Content Dashboard</h1>
         <p className="text-neutral-600">Manage posts from a dedicated admin surface.</p>
-        <div className="pt-2">
+        <div className="flex items-center gap-3 pt-2">
           <Link
             href="/todo"
             className="inline-flex rounded-md border border-neutral-300 px-4 py-2 text-sm font-medium hover:bg-neutral-100"
           >
             Open roadmap and progress
           </Link>
+          <LogoutButton />
         </div>
       </header>