fix: add Vite 9 forward compatibility

[birkskyum]

Summary

• derive client/server hook mode from this.environment.config.consumer
• cover the JSX transform, server-function hooks, and start handler loads
• retain an options.ssr fallback for non-Vite hook contexts
• accept Vite 9 as a peer and enable Vite 8's removal warning in the fixture
• add a patch changeset

Ports the environment-hook update from solidjs/solid-start@85b24b2 (solid-start#2191) to the Solid 2 plugin surface. It also brings the next line in sync with vite-plugin-solid#273.

Testing

• pnpm build
• pnpm check
• Vite 8 fixture build with removePluginHookSsrArgument: 'warn'
• node test/run.mjs prod (51/51 assertions)

[changeset-bot]

🦋 Changeset detected

Latest commit: a9d7772

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

This PR includes changesets to release 1 package

Name	Type
@solidjs/vite-plugin	Patch

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[pkg-pr-new]

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npm i https://pkg.pr.new/@solidjs/vite-plugin@312

commit: a9d7772