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/libphonenumber-js/source/getCountries.test.js

@@ -0,0 +1,9 @@
+import metadata from '../metadata.min.json' with { type: 'json' }
+
+import getCountries from './getCountries.js'
+
+describe('getCountries', () => {
+	it('should get countries list', () => {
+		expect(getCountries(metadata).indexOf('RU') > 0).to.equal(true);
+	})
+})