Support Astro 6

[arbaev]

Summary

• Extend @keystatic/astro peerDependencies to 2 || 3 || 4 || 5 || 6 so the
  integration works with Astro 6.1.8 while remaining compatible with 2–5. No
  runtime changes beyond a @ts-ignore tweak in injectRoute (in Astro 6 types
  the valid key is entrypoint; entryPoint stays for Astro 2/3).
• Update templates/astro and both dev-projects/astro* to Astro 6.1.8 and
  migrate them to the Content Layer API (loader: glob(), render(entry),
  entry.id, config moved to src/content.config.ts).
• Templates/dev-projects gain @astrojs/node with output: 'server' because
  Astro 6 requires an adapter for routes with prerender: false (the Keystatic
  admin UI and API). Public pages keep static output via
  export const prerender = true.
• dev-projects/astro-content: migrate from @astrojs/tailwind (no Astro 6
  support) to @tailwindcss/vite@^4 with a CSS-first config in
  src/styles/global.css.
• Root manypkg.ignoredRules adds EXTERNAL_MISMATCH so the astro-content
  example can run Tailwind 4 while docs and dev-projects/next-blocks-builder
  stay on Tailwind 3.

A changeset bumps @keystatic/astro as a minor release.

Test plan

• pnpm check:types passes
• pnpm check:lint and pnpm check:format pass
• pnpm build:packages produces packages/astro/dist/*
• pnpm --filter @example/astro build succeeds on Astro 6.1.8 (server +
  Node adapter)
• pnpm --filter @example/astro-content build succeeds (Tailwind 4
  CSS-first, Content Layer)
• pnpm --filter @keystatic/templates-astro build succeeds with prerendered
  public pages
• pnpm --filter @example/astro dev — GET /keystatic/ returns 200 with
  the admin UI bundle, nested /keystatic/collection/posts returns 200,
  GET /api/keystatic/github/login returns 307 (OAuth redirect)

[changeset-bot]

🦋 Changeset detected

Latest commit: 01ce28e

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@keystatic/astro	Minor

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​tailwindcss/​typography@​0.5.19

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[pepesrz91]

Hey guys! Are you going to be releasing this support soon? hehe