feat: Reinitialize frontend with SvelteKit and TypeScript

- Delete old Vite+Svelte frontend
- Initialize new SvelteKit project with TypeScript
- Configure Tailwind CSS v4 + DaisyUI
- Implement JWT authentication with auto-refresh
- Create login page with form validation (Zod)
- Add protected route guards
- Update Docker configuration for single-stage build
- Add E2E tests with Playwright (6/11 passing)
- Fix Svelte 5 reactivity with $state() runes

Known issues:
- 5 E2E tests failing (timing/async issues)
- Token refresh implementation needs debugging
- Validation error display timing

frontend/src/routes/+page.svelte

@@ -0,0 +1,18 @@
+<script lang="ts">
+	import { goto } from '$app/navigation';
+	import { isAuthenticated } from '$lib/stores/auth';
+	import { browser } from '$app/environment';
+
+	// Redirect based on auth state
+	$: if (browser) {
+		if ($isAuthenticated) {
+			goto('/dashboard');
+		} else {
+			goto('/login');
+		}
+	}
+</script>
+
+<div class="flex items-center justify-center min-h-screen">
+	<div class="loading loading-spinner loading-lg text-primary"></div>
+</div>