feat(notify-bridge): phase 1 - project scaffolding

Set up the Notify Bridge project structure:
- packages/core (notify_bridge_core) with provider, model, notification, template packages
- packages/server (notify_bridge_server) with FastAPI skeleton and health endpoint
- frontend with SvelteKit 2, Svelte 5, Tailwind CSS v4, static adapter
- Root configs: .gitignore, README.md, CLAUDE.md

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/routes/+layout.svelte

@@ -0,0 +1,7 @@
+<script>
+	import '../app.css';
+
+	let { children } = $props();
+</script>
+
+{@render children()}

frontend/src/routes/+page.svelte

@@ -0,0 +1,9 @@
+<script>
+</script>
+
+<div class="min-h-screen flex items-center justify-center">
+	<div class="text-center">
+		<h1 class="text-4xl font-bold text-foreground mb-2">Notify Bridge</h1>
+		<p class="text-muted-foreground">Service-to-notification bridge</p>
+	</div>
+</div>