feat(frontend): initialize SvelteKit frontend with Tailwind and OpenAPI types

- SvelteKit SPA mode with adapter-static (index.html fallback)
- Tailwind CSS v4 via @tailwindcss/vite with custom color palette
- CSS custom properties for dark/light theme (dark is default)
- Epilogue variable font with preload
- openapi-typescript generates src/lib/api/schema.ts from openapi.yaml
- Friendly domain type aliases in src/lib/api/types.ts

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/static/robots.txt

@@ -0,0 +1,3 @@
+# allow crawling everything by default
+User-agent: *
+Disallow: