fix(vue): run devtools plugins only in the client environment

[barry166]

Changes

Fixes #17494.

• Restricts the plugins returned by vite-plugin-vue-devtools to Vite's client environment.
• Keeps the browser devtools overlay and inspector available while preventing their styled Vue module from being transformed during Astro SSR, where Vite 8 has not initialized the CSS modules cache yet.
• Adds a dev-server regression test with vue({ devtools: true }) enabled.
• Adds a patch changeset for @astrojs/vue.

Testing

• pnpm -C packages/integrations/vue build
• pnpm -C packages/integrations/vue test (24 passing)
• pnpm exec biome check packages/integrations/vue/src/index.ts packages/integrations/vue/test/basics.test.ts packages/integrations/vue/test/fixtures/basics/astro.config.mjs

The new test fails on main with Vite 8's Cannot read properties of undefined (reading 'get') CSS transform error and passes with this change.

Docs

No documentation update is needed; this restores the existing devtools: true behavior.

[changeset-bot]

🦋 Changeset detected

Latest commit: 760d4ce

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

This PR includes changesets to release 30 packages

Name	Type
@astrojs/vue	Patch
@e2e/astro-envs	Patch
@test/astro-cloudflare	Patch
@e2e/errors	Patch
@e2e/view-transitions	Patch
@e2e/vue-component	Patch
@test/0-css	Patch
@test/astro-children	Patch
@test/astro-envs	Patch
@test/astro-slots-nested	Patch
@test/client-only-child-styles	Patch
@test/react-container	Patch
@test/css-pure-chunk-query-params	Patch
@test/fetch	Patch
@test/postcss	Patch
@test/slots-vue	Patch
@test/ssr-renderers-static-vue	Patch
@test/vue-component	Patch
@test/vue-with-multi-renderer	Patch
@test/astro-cloudflare-vite-plugin	Patch
@test/astro-cloudflare-with-vue	Patch
@test/react-component	Patch
@test/vue-app-entrypoint-async	Patch
@test/vue-app-entrypoint-css	Patch
@test/vue-app-entrypoint-no-export-default	Patch
@test/vue-app-entrypoint-relative	Patch
@test/vue-app-entrypoint-src-absolute	Patch
@test/vue-app-entrypoint	Patch
@test/vue-basics	Patch
vue-prop-types	Patch

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