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/svelte.config.js

@@ -0,0 +1,21 @@
+import adapter from '@sveltejs/adapter-node';
+import { vitePreprocess } from '@sveltejs/vite-plugin-svelte';
+
+/** @type {import('@sveltejs/kit').Config} */
+const config = {
+  preprocess: vitePreprocess(),
+  kit: {
+    adapter: adapter({
+      out: 'build',
+      env: {
+        port: process.env.PORT || 5173
+      }
+    }),
+    alias: {
+      $lib: './src/lib',
+      $components: './src/lib/components'
+    }
+  }
+};
+
+export default config;