v1.1.0

Dependency upgrades:
- Astro: 5 -> 6 (latest: 6.1.1)
- @astrojs/react: 4 -> 5 (latest: 5.0.2)
- @tailwindcss/vite: 4.2.2
- tailwindcss: 4.2.2
- Fixed 2 high CVEs: h3 (path traversal), picomatch (ReDoS)

No breaking changes required: zero usage of removed APIs.
Build and all tests pass.