fix: cookies HTTP, logout route prefix, header logout method

inertia/pages/layout/header.vue

@@ -80,6 +80,7 @@ const user = computed(() => {
 
           <Link
             href="/auth/logout"
+            method="post"
             class="flex items-center gap-3 px-4 py-2 text-body-sm font-body-sm text-on-surface hover:bg-surface-container-low transition-colors"
           >
             <span class="material-symbols-outlined text-[20px]">logout</span>