chore(web): upgrade astro

[jens-ox]

Type of change: Refactor / code improvement

What does this PR do?
Upgrades astro from 5.7.13 to the current 5.17.3.. Some old transitive dependencies (like zod-to-ts) are missing licenses, which caused supply chain issues on our end.

The upgrade was done by running the official upgrade tool, @astrojs/upgrade.

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

Thanks for building opencode!

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[Copilot]

Pull request overview

Upgrades the @opencode-ai/web Astro stack to newer Astro 5.x releases to address dependency supply-chain/licensing concerns and keep the web/docs site tooling current.

Changes:

• Bumped astro from 5.7.13 to 5.17.3 and updated related @astrojs/* integrations in packages/web.
• Regenerated bun.lock, pulling in updated transitive dependencies for Astro, Cloudflare adapter, Starlight, and related tooling.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated 1 comment.

File	Description
packages/web/package.json	Updates Astro + key Astro integrations (cloudflare, markdown-remark, solid-js, starlight).
bun.lock	Lockfile updates reflecting the Astro upgrade and transitive dependency shifts (including Cloudflare workers types, sharp, svgo, etc.).

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[Copilot]

toolbeam-docs-theme@0.4.8 declares peer dependencies astro: ^5.7.13 and @astrojs/starlight: ^0.34.3 (see bun.lock). With astro now set to 5.17.3 (and Starlight bumped), this will be an unsatisfied peer range and may break the docs theme integration. Consider upgrading toolbeam-docs-theme to a version compatible with Astro 5.17.x / Starlight 0.37.x, or keep Astro/Starlight pinned to versions that satisfy the theme’s peer requirements.