feat(docker-watcher): phase 10 - quick deploy & settings pages

Quick deploy with 3-step flow (paste URL, inspect, deploy).
Settings pages for global config, registries CRUD with test connection,
NPM credentials with masked display. Toast notification system.
Mount Toast component in root layout.

web/src/routes/+layout.svelte

@@ -2,6 +2,7 @@
 	import '../app.css';
 	import type { Snippet } from 'svelte';
 	import { page } from '$app/stores';
+	import Toast from '$lib/components/Toast.svelte';
 
 	interface Props {
 		children: Snippet;
@@ -76,3 +77,5 @@
 		</div>
 	</main>
 </div>
+
+<Toast />