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

backend/storage/app/.gitignore

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+*
+!private/
+!public/
+!.gitignore

backend/storage/app/private/.gitignore

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+*
+!.gitignore

backend/storage/app/public/.gitignore

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+*
+!.gitignore

backend/storage/framework/.gitignore

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+compiled.php
+config.php
+down
+events.scanned.php
+maintenance.php
+routes.php
+routes.scanned.php
+schedule-*
+services.json

backend/storage/framework/cache/.gitignore

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+*
+!data/
+!.gitignore

backend/storage/framework/cache/data/.gitignore

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+*
+!.gitignore

backend/storage/framework/sessions/.gitignore

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+*
+!.gitignore

backend/storage/framework/testing/.gitignore

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+*
+!.gitignore

backend/storage/framework/views/.gitignore

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+*
+!.gitignore

backend/storage/logs/.gitignore

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+*
+!.gitignore