deps(docs): bump astro to 6.1.6 and starlight ecosystem

[AnExiledDev]

Summary

Bumps the docs site to Astro 6 (fixing XSS security alerts #28, #29) and all starlight ecosystem packages to compatible versions.

Requested bumps

• astro: ^5.18.0 → ^6.1.6 (fixes XSS in define:vars — CVE alerts Add container runtime pre-flight check #28, Fix commit-reminder blocking and test-runner tmp file mismatch #29)
• @astrojs/sitemap: 3.7.0 → 3.7.1
• @astrojs/starlight-tailwind: ^4.0.2 → ^5.0.0
• starlight-image-zoom: ^0.13.2 → ^0.14.1
• starlight-versions: ^0.7.0 → ^0.8.1

Cascading Astro 6 compatibility bumps

• @astrojs/starlight: ^0.37.6 → ^0.39.1
• starlight-links-validator: ^0.19.2 → ^0.24.0
• starlight-llms-txt: ^0.7.0 → ^0.8.1
• starlight-scroll-to-top: ^0.4.0 → ^1.0.1
• starlight-sidebar-topics: ^0.6.2 → ^0.7.1
• starlight-tags: ^0.4.0 → ^1.0.1
• starlight-kbd: ^0.3.0 → ^0.4.0
• tailwindcss + @tailwindcss/vite: ^4.2.1 → ~4.1.11 (4.2.x requires Vite 8; Astro 6 ships Vite 7)
• Removed zod override (was 3.25.76; Astro 6 requires zod ^4.3.6)

Supersedes #55, #57, #56, #54, #53.

Verification

• npm install ✅
• npm run build — 58 pages built, all links valid, 0 vulnerabilities ✅

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