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/dashboard/+layout.ts

@@ -0,0 +1,18 @@
+import { browser } from '$app/environment';
+import { goto } from '$app/navigation';
+import { getAccessToken } from '$lib/services/api';
+import type { LayoutLoad } from './$types';
+
+export const load: LayoutLoad = async () => {
+  // Check authentication on client side using localStorage (source of truth)
+  if (browser) {
+    const token = getAccessToken();
+    
+    if (!token) {
+      goto('/login');
+      return { authenticated: false };
+    }
+  }
+
+  return { authenticated: true };
+};