feat(permissions): add per-group features.user_webhooks permission (#25923)

src/lib/components/chat/Settings/Account.svelte

@@ -227,7 +227,7 @@
 			</div>
 		</div>
 
-		{#if $config?.features?.enable_user_webhooks}
+		{#if $config?.features?.enable_user_webhooks && ($user?.role === 'admin' || ($user?.permissions?.features?.user_webhooks ?? false))}
 			<div class="mt-2">
 				<div class="flex flex-col w-full">
 					<div class=" mb-1 text-xs font-medium">{$i18n.t('Notification Webhook')}</div>