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/node_modules/happy-dom/lib/event/events/IKeyboardEventInit.d.ts

@@ -0,0 +1,17 @@
+import IUIEventInit from '../IUIEventInit.js';
+export default interface IKeyboardEventInit extends IUIEventInit {
+    key?: string;
+    code?: string;
+    location?: number;
+    ctrlKey?: boolean;
+    shiftKey?: boolean;
+    altKey?: boolean;
+    metaKey?: boolean;
+    repeat?: boolean;
+    isComposing?: boolean;
+    /**
+     * @deprecated
+     */
+    keyCode?: number;
+}
+//# sourceMappingURL=IKeyboardEventInit.d.ts.map