refactor(create-react-router): use native Fetch

[MichaelDeBoey]

Resubmission of #14140

As mentioned in remix-run/web-std-io#42 (comment), we probably don't need to use the agent option, so we can just use native Fetch API completely

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I'm sure people from the wider @e18e ecosystem cleanup (like @43081j, @benmccann, @Fuzzyma, @outslept & @v1rtl) will be very happy to see these kind of changes as well

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[Copilot]

Pull request overview

Refactors create-react-router’s template download path to rely on Node’s native Fetch API (Node >=18) instead of @remix-run/web-fetch, simplifying dependencies and removing custom agent handling.

Changes:

• Removed @remix-run/web-fetch and proxy-agent dependencies from create-react-router.
• Updated template download logic to use the global fetch without passing an agent.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 1 comment.

File	Description
packages/create-react-router/package.json	Drops fetch/proxy-related dependencies now that Node’s native fetch is used.
packages/create-react-router/copy-template.ts	Removes custom ProxyAgent logic and switches fetch calls to native fetch.

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