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/ajv/scripts/prepare-tests

@@ -0,0 +1,12 @@
+#!/usr/bin/env sh
+
+set -e
+
+mkdir -p .browser
+
+echo
+echo Preparing browser tests:
+
+find spec -type f -name '*.spec.js' | \
+xargs -I {} sh -c \
+'export f="{}"; echo $f; browserify $f -t require-globify -t brfs -x ajv -u buffer -o $(echo $f | sed -e "s/spec/.browser/");'